Hell-raiser gets grief from producer (12)
I believe the answer is:
troublemaker
'hell-raiser' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?
'grief from producer' is the wordplay.
'grief' becomes 'trouble' (I can't justify this - if you can you should believe this answer much more).
'from' means one lot of letters go next to another.
'producer' becomes 'maker' (I've seen this before).
'trouble'+'maker'='TROUBLEMAKER'
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for troublemaker that I've seen before include "One inciting unrest" , "Inciter of unrest" , "Deliberate causer of problems" , "source of agitation" , "Cause of conflict" .)