Toil to create party (6)
I believe the answer is:
labour
I believe this clue is a double definition.
'toil' is the first definition.
(I know that toil can be written as labour)
'party' is the second definition.
(I know that Labour is a type of labor party)
'to create' acts as a link.
(Other definitions for labour that I've seen before include "Shakespeare: 'Love's ...... Lost'" , "Old political party?" , "Donkey-work" , "Productive work" , "Left - work" .)