Complete part of joint activity (6)

I believe the answer is:

intact

'complete' is the definition.
(intact can mean complete or undamaged)

'part of joint activity' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'INTACT' can be found hidden inside 'joint activity'.

(Other definitions for intact that I've seen before include "Complete - unbroken" , "Undamaged, not broken" , "Entire, undamaged" , "Whole and unharmed" , "Perfect" .)

I've seen this clue in The Times.

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