Governor from Sparta (6)
I believe the answer is:
satrap
'governor' is the definition.
(satrap is a kind of governor)
'from sparta' is the wordplay.
'from' indicates an anagram (from the letters).
'sparta' anagrammed gives 'SATRAP'.
(Other definitions for satrap that I've seen before include "Persian provincial governor" , "Old Persian ruler" , "Persian governor of old; small-time dictator" , "Raps at the governor in ancient Persia" , "Old Persian governor - a sprat (anag)" .)