Recess taken from rap session (4)

I believe the answer is:

apse

'recess' is the definition.
(apse is a kind of recess)

'taken from rap session' is the wordplay.
'taken from' says the answer is hidden in the clue.
'APSE' is hidden within 'rap session'.

(Other definitions for apse that I've seen before include "Semicircular recess in church" , "Peas (anag) -- part of a church" , "Strange peas in the church recess" , "Recess in church wall" , "Recess at east end of church" .)

I've seen this clue in The Everyman puzzle in The Observer.

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