Billie Jean (née Moffitt, 1943) (4)

I believe the answer is:

king

(Other definitions for king that I've seen before include "Honour for man" , "Male on the throne" , "Playing-card" , "indispensable on board" , "- Cobra; - crab; - post; - prawn" .)

I've seen this clue in The Guardian.

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