Crossword Genius

Polish expert (4)

Ross

I believe the answer is:

buff

I believe this clue is a double definition.

'polish' is the first definition.
(buffing is a kind of polishing)

'expert?' is the second definition.
(thesaurus)

(Other definitions for buff that I've seen before include "fan of > nudism?" , "light shade" , "Polish - fan" , "with attractively well-developed muscles" , "Informal enthusiast - polish him" .)

I've seen this clue in the Evening Standard, The Everyman puzzle in The Observer, The Telegraph and The Mirror.
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