Wildly chants part of the refrain (6)

I believe the answer is:

snatch

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'part of the refrain' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'wildly chants' is the wordplay.
'wildly' indicates anagramming the letters.
'chants' anagrammed gives 'SNATCH'.

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(Other definitions for snatch that I've seen before include "heist" , "bag" , "Few bars of music - grab" , "Bit of a song" , "Snippet" .)

I've seen this clue in the Evening Standard.

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