Defeat, master (4)

I believe the answer is:

best

I believe this clue is a double definition.

'defeat' is the first definition.
(I know this)

'master' is the second definition.
(thesaurus)

(Other definitions for best that I've seen before include "12 21[FOOTBALLER" , "Optimal" , "Top; defeat" , "Of the highest quality" , "Optimum" .)

I've seen this clue in The Mirror.

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