Go and film defector (8)
I believe the answer is:
turncoat
'defector' is the definition.
(I've seen this before)
'go and film' is the wordplay.
'go' becomes 'turn' ('turn' can be a synonym of 'go'**).
'and' is a charade indicator (letters next to each other).
'film' becomes 'coat' (I've seen this in other clues).
'turn'+'coat'='TURNCOAT'
(Other definitions for turncoat that I've seen before include "treacherous as one?" , "Traitor with reversed garment" , "Rat" , "'Renegade, traitor (8)'" , "One betraying party" .)