Polonaise in G finishing brilliantly (6,9)
I believe the answer is:
french polishing
'finishing brilliantly' is the definition.
'polonaise in g' is the wordplay.
'polonaise' becomes 'frenchpolish' (French for "Polish").
'frenchpolish'+'in'+'g'='FRENCH-POLISHING'
I've seen this clue in The Telegraph.
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