Dope and beer? Bishop'll avoid that! (3)
I believe the answer is:
ass
'dope' is the definition.
(both can mean a stupid person)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ass that I've seen before include "Small hoofed animal" , "Charlie" , "Long-eared animal" , "animal inside" , "Clot" .)