Source of portions of chicken (3)

I believe the answer is:

hen

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This clue might be a double definition.

'source' is the first definition.
(I have seen 'Source of eggs ' mean 'hen' so perhaps 'source' could also mean 'hen')

'portions of chicken' is the second definition.
'hen' can be an answer for 'chicken' (hen is a kind of chicken). I am not sure about the 'portions of' bit.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for hen that I've seen before include "Farm bird" , "Domestic egg layer" , "Composed of women" , "Female bird" , "Female lobster, fowl" .)

I've seen this clue in the Evening Standard.

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