Possible Clues:

• Search among discarded waste
• Dump work to exact retribution for barman to begin with
• Hunt through garbage
• Collect discarded food
• Be vulturous
• Feed on carrion or refuse
• Forage
• Rummage in the bin, namely, to get one's own back
• Look for scrap, about to cut Swede up for example
• ". . . ran, like little half-tame animals on the ––, through the alleys of the great market" (Penelope Fitzgerald)