Red anger about cultivator (8)
I believe the answer is:
gardener
'cultivator' is the definition.
(I've seen this before)
'red anger about' is the wordplay.
'about' indicates an anagram.
'red'+'anger'='redanger'
'redanger' anagrammed gives 'GARDENER'.
(Other definitions for gardener that I've seen before include "Plant tender" , "One may get food" , "He tends cultivated land around house" , "Cultivator" , "Nursery employee" .)