Crossword Genius

Yellow as some supermarket chickens? (7)

Ross

I believe the answer is:

gutless

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

I don't understand the remainder of the clue.

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(Other definitions for gutless that I've seen before include "Cowardly, lacking intestines" , "Chicken-livered" , "Lacking courage and determination" , "Showing no evidence of bottle" , "racket like this is not much use" .)

I've seen this clue in The Sun.
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