Works hard to see constituencies adopting women (6)
I believe the answer is:
sweats
'works hard' is the definition.
(I've seen this before)
'constituencies adopting women' is the wordplay.
'constituencies' becomes 'seats' (MPs hold seats and represent constituencies).
'adopting' is an insertion indicator.
'women' becomes 'w'.
'seats' enclosing 'w' is 'SWEATS'.
'to see' acts as a link.
(Other definitions for sweats that I've seen before include "Casual dress" , "old soldiers" , "Perspires" , "Works hard" , "Clothes" .)