Turn up to take the water here at the end of June in the Abbey, perhaps. (4)
I believe the answer is:
apse
'turn up to take the water here at the end of june in the abbey perhaps' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'turn up to take the water here at the end of june' is the wordplay.
'turn up' is a reversal indicator.
'to take the water here' becomes 'spa' (I can't justify this - if you can you should give a lot more credence to this answer).
'at the end of' suggests the final letters.
The last letter of 'june' is 'e'.
'spa' written backwards gives 'aps'.
'aps'+'e'='APSE'
Can you help me to learn more?
(Other definitions for apse that I've seen before include "Large recess in church" , "Strange peas in the church recess" , "Church's part" , "where praetor sat" , "Recess at eastern end of a church" .)