One month camping following a repayment (9)
I believe the answer is:
atonement
'repayment' is the definition.
(thesaurus)
'one month camping following a' is the wordplay.
I cannot really see how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is present in the answer.
'a' could be 'one' and 'one' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for atonement that I've seen before include "Making amends" , "Compensation for a wrong" , "reparations?" , "satisfaction" , "Expiation of sin, penance" .)