Ensconse was an American-bred, British-trained Thoroughbred racehorse and broodmare. In 1988 she showed considerable promise as she won a twenty-five runner maiden race and the Blue Seal Stakes in her two racecourse appearances. In the following year she won the Nell Gwyn Stakes and finished fourth when favourite for the 1000 Guineas before recording her biggest success when winning the Irish 1000 Guineas. In her two remaining starts she was unlucky in running when sixth in the Prix de Diane and ran second in the Child Stakes. She was retired from racing at the end of the year to become a broodmare but produced only two foals, neither of whom had any success on the racecourse.
Ensconse made her racecourse debut in a maiden race over six furlongs at Nottingham Racecourse on 5 September. Starting the 3/1 second favourite in a twenty-five runner field she took the lead two furlongs from the finish and won by three quarters of a length from the Michael Stoute-trained Dance Festival. Seventeen days later over the same distance at Ascot Racecourse the filly started joint-favourite for the Blue Seal Stakes. She took the lead approaching the last quarter mile and won by a length Guest Artiste.
1989: three-year-old season
On 18 April 1989 Ensconse began her second season by contesting the Nell Gwyn Stakes over seven furlongs at Newmarket Racecourse and started the 2/1 joint favourite alongside Mythyaar. The other six runners included Guest Artiste, Muhbubh and Miss Demure. After being restrained by Cochrane in the early stages she accelerated in the last quarter mile, overtook the outsider Aldbourne inside the final furlong and won by one and a half lengths with two lengths back to Muhbubh in third. In the 176th running of the 1000 Guineas over the Rowley Mile at Newmarket on 4 May, Ensconse started the 7/4 favourite ahead of Musical Bliss and Pass the Peace in a seven-runner field. She raced towards the rear of the field in a slowly-run race and was unable to make significant progress in the closing stages, finishing fourth behind Musical Bliss, Kerrera and Aldbourne. The Irish 1000 Guineas at the Curragh on 27 May saw Ensconse made the 13/8 favourite in a field of thirteen. Aldbourne and Dance Festival were again in opposition whilst the other runners included Flamenco Wave, Tursanah, Blasted Heath and Honoria. After tracking the leaders Ensconse took the lead approaching the last quarter mile, broke clear of her opponents and stayed on to win by two lengths from Aldbourne. On 11 June Ensconse was sent to France and moved up in distance for the Prix de Diane over 2000 metres at Chantilly Racecourse. Ridden by Pat Eddery she was hampered at half way and dropped back to last place before staying on in the straight to finish sixth of the fourteen runners behind Lady In Silver. In July she was dropped back to one mile and started favourite for the Child Stakes at Newmarket in which she finished second to Magic Gleam.
Breeding record
After her retirement from racing Ensconse became a broodmare for her owner's stud. She produced only two reported foals, neither of whom made any impact:
Bal Masque, a chestnut colt, foaled in 1991, sired by Alydar. Unplaced on only start.