Crossword Genius

It's improving -- fine grin is spreading (8)


I believe the answer is:


'it's improving' is the definition.
(refining is a kind of improving)

'fine grin is spreading' is the wordplay.
'is spreading' is an anagram indicator.
'finegrin' with letters rearranged gives 'REFINING'.

(Other definitions for refining that I've seen before include "Improving by pruning or polishing" , "Infringe in removing impurities" , "Making pure" , "Purifying; clarifying" .)

I've seen this clue in The Telegraph.
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