Go and pelt renegade (8)
I believe the answer is:
turncoat
'renegade' is the definition.
(I know that renegade can be written as turncoat)
'go and pelt' is the wordplay.
'go' becomes 'turn' (as in one's go or turn in a game).
'and' means one lot of letters go next to another.
'pelt' becomes 'coat' (I've seen this in other clues).
'turn'+'coat'='TURNCOAT'
(Other definitions for turncoat that I've seen before include "Traitor with inverted garment" , "One betraying party" , "Traitor with reversed garment" , "Judas" , "Traitor, defector" .)