Wrong colours disheartened Persian governor (9)
I believe the answer is:
proconsul
'governor' is the definition.
(proconsul is a kind of governor)
'wrong colours disheartened persian' is the wordplay.
'wrong' is an anagram indicator.
'disheartened' says to hollow out the word (remove centre letters).
'persian' with its centre taken out is 'pn'.
'colours'+'pn'='colourspn'
'colourspn' with letters rearranged gives 'PROCONSUL'.
(Other definitions for proconsul that I've seen before include "Ancient Roman provincial governor" , "magistrate" .)