Crossword Genius

Colleague removing last of garbage from narrow street (4)

Ross

I believe the answer is:

ally

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'colleague' is the definition.
(ally can mean a colleague or associate)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ally that I've seen before include "A friendly and reliable country" , "One co-operating with another" , "Join by marriage, treaty etc" , "Join forces with" , "Confederate; supporter" .)

I've seen this clue in The Times.
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