The devil can be fined! (5)
I believe the answer is:
fiend
'the devil' is the definition.
(synonyms)
'can be fined' is the wordplay.
'can be' indicates an anagram.
'fined' anagrammed gives 'FIEND'.
(Other definitions for fiend that I've seen before include "Operatic super-soprano" , "Devilish person" , "Demon; cruel person" , "Devil" , "Evil supernatural being" .)