Betray defender as a butcher perhaps (10)
I believe the answer is:
shopkeeper
'a butcher perhaps' is the definition.
I can't judge whether this defines the answer.
'betray defender' is the wordplay.
'betray' becomes 'shop' (I've seen this before).
'defender' becomes 'keeper' (keeper is a kind of defender).
'shop'+'keeper'='SHOPKEEPER'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for shopkeeper that I've seen before include "Counter-agent" , "E.g. newsagent" , "Tradesperson" , "perhaps Napoleon's man in England?" .)