Finished with a clipper - it turned and went, say (4,10)

I believe the answer is:

past participle

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'and went say' is the definition.
I can't judge whether this defines the answer.

'finished with a clipper it turned' is the wordplay.
'finished with' becomes 'past' (past can mean forgotten or finished).
'turned' is an anagram indicator.
'a'+'clipper'+'it'='aclipperit'
'aclipperit' anagrammed gives 'participle'.
'past'+'participle'='PAST PARTICIPLE'

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(Another definition for past participle that I've seen is " had, say".)

I've seen this clue in The Daily Express.

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