Remove it possibly for extra payment (8)
I believe the answer is:
overtime
'extra payment' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'remove it possibly' is the wordplay.
'possibly' indicates an anagram.
'remove'+'it'='removeit'
'removeit' with letters rearranged gives 'OVERTIME'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for overtime that I've seen before include "Pay for extra work" , "Extra hours (at work)" , "Work in excess of fixed period" , "Hours worked in excess of usual" , "opportunity for supplementing income" .)