Crossword Genius

Vagrant ingredient of egg-white (3)

Ross

I believe the answer is:

bum

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'vagrant' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for bum that I've seen before include "Cadge" , "American hobo or English bottom" , "American tramp or English bottom" , "US tramp" , "Begging" .)

I've seen this clue in the Sydney Morning Herald.
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