Billie Jean , 1975 Wimbledon ladies' singles tennis champion (4)

I believe the answer is:

king

(Other definitions for king that I've seen before include "and 21 Across: Shakespeare play" , "- Cobra; - crab; - post; - prawn" , "US civil rights leader, assassinated 1968" , "indispensable on board" , "Most important chesspiece" .)

I've seen this clue in The Mirror.

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