Beginners in all primary schools enjoy recess (4)
I believe the answer is:
apse
'recess' is the definition.
(apse is a kind of recess)
'beginners in all primary schools enjoy' is the wordplay.
'beginners in' suggests taking the first letters.
The initial letters of 'all primary schools enjoy' is 'APSE'.
(Other definitions for apse that I've seen before include "space for altar" , "Church area" , "In sacred space" , "Semicircular recess in church" , "Offshoot from the choir, nave or aisle in a church" .)