Grandee in disguise seeing red (7)
I believe the answer is:
enraged
'seeing red' is the definition.
(I've seen this in another clue)
'grandee in disguise' is the wordplay.
'in disguise' is an anagram indicator.
'grandee' with letters rearranged gives 'ENRAGED'.
(Other definitions for enraged that I've seen before include "Made very angry" , "Furious" , "Wild" , "Maddened" , "Angered (anag) - extremely so!" .)