Those against the Tories (4)
I believe the answer is:
cons
I believe this clue is a double definition.
'those against' is the first definition.
(I've seen this in another clue)
'tories' is the second definition.
(short for Conservatives)
'the' is the link.
(Other definitions for cons that I've seen before include "Swindles" , "Tricks" , "Arguments against" .)