Governor's role when recalled (6)
I believe the answer is:
satrap
'governor's' is the definition.
(satrap is a kind of governor)
'role when recalled' is the wordplay.
'role' becomes 'part' ('part' can be a synonym of 'role').
'when' becomes 'as'.
'recalled' says the letters should be written backwards.
'part'+'as'='partas'
'partas' reversed gives 'SATRAP'.
(Other definitions for satrap that I've seen before include "Persian provincial governor" , "Old Persian governor took a seat to start" , "Old Persian ruler" , "Persian governor of old; small-time dictator" , "local ruler" .)