Livid Tory (4)
I believe the answer is:
blue
This clue is a double definition.
'livid' is the first definition.
(I've seen this in another clue)
'tory' is the second definition.
(blue can mean relating to the Conservative Party)
(Other definitions for blue that I've seen before include "Varsity sportsman" , "Naughty < sportsman" , "Azure" , "Between green and violet" , "Vulgar" .)