Stomach after lemon chicken (11)

I believe the answer is:

yellowbelly

I'm a little stuck... Click here to teach me more about this clue!

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

'stomach after lemon' is the wordplay.
I cannot quite see how this works, but
'stomach' could be 'belly' (synonyms) and 'belly' is found within the answer.
The remaining letters 'yellow' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for yellowbelly that I've seen is " chicken".)

I've seen this clue in The Times.

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