Unfit meal aroused rage (9)
I believe the answer is:
fulminate
'rage' is the definition.
(thesaurus)
'unfit meal aroused' is the wordplay.
'aroused' is an anagram indicator (letters roused or stirred up into a new form).
'unfit'+'meal'='unfitmeal'
'unfitmeal' with letters rearranged gives 'FULMINATE'.
(Other definitions for fulminate that I've seen before include "Protest loudly and bitterly" , "Explode with anger, criticism" , "Rail" , "blow out" .)