Work hard with women in constituency (5)
I believe the answer is:
sweat
'work hard' is the definition.
(I've seen this in another clue)
'women in constituency' is the wordplay.
'women' becomes 'w'.
'in' is an insertion indicator.
'constituency' becomes 'seat' (House of Commons seats represent constituencies).
'w' put inside 'seat' is 'SWEAT'.
'with' is the link.
(Other definitions for sweat that I've seen before include "Soldier" , "Waste (anag.)" , "It's hard work" , "Trouble in Australia" , "Salty fluid secreted by the body" .)