Viceroy posed with charge (6)
I believe the answer is:
satrap
'viceroy' is the definition.
(thesaurus)
'posed with charge' is the wordplay.
'posed' becomes 'sat' (posed or sat for an artist).
'with' is a charade indicator (letters next to each other).
'charge' becomes 'rap' (both can mean blame or responsibility).
'sat'+'rap'='SATRAP'
(Other definitions for satrap that I've seen before include "Old Persian governor took a seat to start" , "Persian governor of old; small-time dictator" , "Old Persian ruler" , "local ruler" , "Sparta (anag.)" .)