Fool returning to Amin (5)
I believe the answer is:
idiot
'fool' is the definition.
(synonyms)
'returning to amin' is the wordplay.
'returning' says the letters should be written in reverse.
'amin' becomes 'idi' (I've seen this in another clue).
'to'+'idi'='toidi'
'toidi' in reverse letter order is 'IDIOT'.
(Other definitions for idiot that I've seen before include "Dunce" , "Unwise person" , "'The -----'. novel by Dostoyevsky (1868)" , "Silly ass" , "Dipstick" .)