Clergyman in drink is confused (5)
I believe the answer is:
addle
'is confused' is the definition.
(I've seen this before)
'clergyman in drink' is the wordplay.
'clergyman' becomes 'dd' (Doctor of Divinity).
'in' indicates putting letters inside.
'drink' becomes 'ale' (type of beer).
'dd' inserted into 'ale' is 'ADDLE'.
(Other definitions for addle that I've seen before include "Get confused" , "Confuse; become rotten" , "Muddle or confuse" , "Make confused - go bad" , "Befuddle" .)