Crossword Genius

Yellow that comes from egg (7)

Ross

I think it could be either:

chicken

albumen
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'yellow' is the definition.
(as in cowardly)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for chicken that I've seen before include "Yellow - young fowl" , "Proverbial road-crosser" , "Cowardly - young fowl" , "Bird, coward (colloq.)" , "easily scared" .)

I've seen this clue in The Times and The Sunday Times.
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