Pay it’s wrong to hang on to (7)
I believe the answer is:
stipend
'pay' is the definition.
(I've seen this in another clue)
'it's wrong to hang on to' is the wordplay.
'wrong' indicates anagramming the letters.
'to hang on to' becomes 'pend' (I can't explain this - if you can you should give a lot more credence to this answer).
'its' is an anagram of 'sti'.
'sti'+'pend'='STIPEND'
Can you help me to learn more?
(Other definitions for stipend that I've seen before include "minister's wages" , "Regular payment" , "Regular allowance" , "Salary, allowance" , "Regular salary" .)