Rent money, moderate (5)
I believe the answer is:
lease
'rent' is the definition.
(I've seen this before)
'money moderate' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'moderate' becomes 'ease'.
'l'+'ease'='LEASE'
(Other definitions for lease that I've seen before include "From legal document" , "Rent (a property)" , "Tenancy agreement" , "Charter" , "Contract to rent" .)