Polish fan (4)

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)

'fan' is the second definition.
(synonyms)

(Other definitions for buff that I've seen before include "Dull brownish-yellow - expert" , "Blow" , "Yellowish brown" , "Yellowish-beige; expert" , "Informal enthusiast - polish him" .)

I've seen this clue in The Telegraph, The Guardian and The Sun.

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