Turn bank payment into beer (5)
I believe the answer is:
addle
'turn' is the definition.
(thesaurus)
'bank payment into beer' is the wordplay.
'bank payment' becomes 'DD' (direct debit).
'into' indicates putting letters inside.
'beer' becomes 'ale' (type of beer).
'dd' going into 'ale' is 'ADDLE'.
(Other definitions for addle that I've seen before include "Like a bad egg" , "Muddle or confuse" , "Confuse - decay" , "Scramble" , "Go rotten" .)