She's a traitor? Slightly (6)
I believe the answer is:
rather
'slightly' is the definition.
(thesaurus)
'she's a traitor?' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'she' could be 'her' (I've seen this in other clues) and 'her' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rather that I've seen before include "Most certainly" , "On the contrary; sooner" , "Slightly, more so than not (6" , "Quite, sort of" , "Fairly" .)