Informant and traitor combination that's not venomous (5,5)
I believe the answer is:
grass snake
'not venomous' is the definition.
I can't judge whether this defines the answer.
'informant and traitor combination' is the wordplay.
'informant' becomes 'grass' (term for an informant or traitor).
'and' is a charade indicator (letters next to each other).
'traitor combination' becomes 'snake' (I can't explain this - if you can you should believe this answer much more).
'grass'+'snake'='GRASS SNAKE'
'that's' is the link.
Can you help me to learn more?
(Another definition for grass snake that I've seen is " legless wild thing".)