Crossword Genius

One winding up bluff setter about daughter (9)

Ross

I believe the answer is:

concluder

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'one winding up' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'bluff setter about daughter' is the wordplay.
'bluff' becomes 'con' (bluff can mean a trick or con).
'setter' becomes 'cluer' (I can't justify this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'daughter' becomes 'd' (genealogical abbreviation).
'cluer' placed around 'd' is 'cluder'.
'con'+'cluder'='CONCLUDER'

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I've seen this clue in The Sunday Times and The Times.
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