Work party that Boris is against? (6)
I believe the answer is:
labour
This clue is a double definition.
'work' is the first definition.
(I know that labour is a more specific form of the action work)
'party that boris is against?' is the second definition.
(Labour Party)
(Other definitions for labour that I've seen before include "Men are never in this" , "opposition" , "Donkey-work" , "Agonising time" , "hands?" .)