Relevant part in chapter (3)

I believe the answer is:

apt

'relevant' is the definition.
(I've seen this in another clue)

'part in chapter' is the wordplay.
'part in' indicates the answer is hidden within the clue.
'APT' can be found hidden inside 'chapter'.

(Other definitions for apt that I've seen before include "Suitable for Pat" , "Relevant" , "flat" , "Tending" , "Prone" .)

I've seen this clue in The Sun.

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