Component, constituent (4)

I believe the answer is:

part

I believe this is a double definition.

'component' is the first definition.
(a component is a part of something)

'constituent' is the second definition.
(a part is a constituent of something)

(Other definitions for part that I've seen before include "Constituent - something to play?" , "Piece, segment" , "Fraction of the whole - separate" , "Piece; divide" , "Section of a whole" .)

I've seen this clue in The Irish Times.

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