'Quite agreeable, collecting rubbish' (wink, wink!) (7)
I believe the answer is:
nictate
'wink wink' is the definition.
(to nictate is to wink)
'quite agreeable collecting rubbish' is the wordplay.
'quite agreeable' becomes 'nice'.
'collecting' is an insertion indicator.
'rubbish' becomes 'tat' (low-quality items or material).
'nice' placed around 'tat' is 'NICTATE'.
(Other definitions for nictate that I've seen before include "Blink - enact it (anag)" , "Wink" , "shut their eyes momentarily" .)