Hang about in a Brummie's barge? (6)
I believe the answer is:
loiter
'hang about' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for loiter that I've seen before include "Dawdle, hang around" , "Linger, tarry" , "Hang around, lurk" , "Hang around, perhaps with intent" , "Wait suspiciously" .)