The Church's part in a chap's education (4)
I believe the answer is:
apse
'the church's part' is the definition.
(I've seen this before)
'in a chap's education' is the wordplay.
'in' indicates the answer is hidden within the clue.
'APSE' is hidden within 'chaps education'.
(Other definitions for apse that I've seen before include "Recess at eastern end of a church" , "inside church?" , "place in church" , "part of cathedral" , "Peas (anag) - found in church" .)