Are gents revolting to separate? (8)
I believe the answer is:
estrange
'separate?' is the definition.
(I've seen this before)
'are gents revolting' is the wordplay.
'revolting' indicates an anagram.
'are'+'gents'='aregents'
'aregents' is an anagram of 'ESTRANGE'.
'to' acts as a link.
(Other definitions for estrange that I've seen before include "Cause to become unfriendly using reagents" , "Reagents (anag.)" , "may break up" , "disunity" , "Get cut off" .)