Conservatives (6)
I believe the answer is:
tories
'conservatives' is the definition.
(informal term for the Conservative Party)
This is all the clue.
(Other definitions for tories that I've seen before include "Informal members of Conservative party in England" , "Members of the British Conservative Party" , "Members of the English Conservative Party" , "Conservative-leaning politicians, from the Irish for 'robbers'" , "Old British Conservatives" .)