Hang about in a Brummie's barge? (6)

I believe the answer is:

loiter

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'hang about' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(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" .)

I've seen this clue in The Independent.

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