Conservative Brit (4)
I believe the answer is:
tory
'conservative brit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tory that I've seen before include "English Conservative politician or Donegal island" , "Opponent of 8 Down and 14 Across, partner of 14 Down?" , "blue" , "A British Conservative" , "type on right? Yes" .)