Confuse clergyman getting in the beer (5)
I believe the answer is:
addle
'confuse' is the definition.
(I know that addle is a type of confuse)
'clergyman getting in the beer' is the wordplay.
'clergyman' becomes 'dd' (Doctor of Divinity).
'getting in' means one lot of letters goes inside another.
'the beer' becomes 'ale' (type of beer).
'dd' put into 'ale' is 'ADDLE'.
(Other definitions for addle that I've seen before include "(Of eggs) turn bad" , "Go rotten" , "(Of eggs) become rotten" , "Make confused - go bad" , "(Of egg) become rotten" .)