Unlimited trips for section of church (4)
I believe the answer is:
apse
'section of church' is the definition.
(I've seen this in other clues)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for apse that I've seen before include "Semicircular recess in church" , "Church recess with domed or arched roof" , "Strange peas in the church recess" , "Church area" , "Church recess in lapsed condition" .)