Frederick ____ was the Royal Ballet's chief choreographer until 1970 (6)

I believe the answer is:

ashton

(Other definitions for ashton that I've seen before include "Sir Frederick -, 20th century choreographer, dancer" , "Sir Frederick __ , choreographer, d. 1988" , "Sir Frederick --, British choreographer" , "Lancashire town - dancer - Rugby coach" , "Sir Frederick -, English choreographer/dancer" .)

I've seen this clue in The Times.

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