Canned portion of poultry or chicken (5)

I believe the answer is:

capon

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'chicken' is the definition.
(I know that capon is a type of chicken)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for capon that I've seen before include "for lunch, perhaps" , "Male fowl fattened for eating" , "one fattened specially" , "Castrated fowl, for eating" , "Bird fattened for eating" .)

I've seen this clue in the Evening Standard.

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