Find some supermarket chickens so yellow? (7)
I believe the answer is:
gutless
'yellow?' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for gutless that I've seen before include "Chicken-livered" , "chicken?" , "lacking a beer belly?" , "Yellow" , "Perhaps trim" .)