Regret when school subject is squeezed — money found (5)
I believe the answer is:
rupee
'regret when school subject is squeezed money found' is the definition.
I know that 'money' relates to this answer.
'regret when school subject is squeezed money' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
'money' could be 'p' and 'p' is present in the answer.
'regret' could be 'rue' (synonyms) and 'rue' is found within the leftover letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
(Other definitions for rupee that I've seen before include "Indian monetary unit" , "little money abroad" , "India's currency" , "cash" , "Indian currency unit" .)