Stick out as a deviant doubter (7)
I believe the answer is:
obtrude
'stick out' is the definition.
(I've seen this before)
'a deviant doubter' is the wordplay.
'a deviant' is an anagram indicator.
'doubter' is an anagram of 'OBTRUDE'.
'as' acts as a link.
(Other definitions for obtrude that I've seen before include "Interfere" , "Be offensively prominent" , "Push oneself in an unwelcome way" , "Make unpleasantly noticeable" , "Thrust oneself forward" .)