Spartan (7)

I believe the answer is:
austere
'spartan' is the definition.
(I know that spartan can be written as austere)
This is all the clue.
(Other definitions for austere that I've seen before include "Severe or strict in attitude" , "Severe; lacking luxuries" , "Harsh" , "Severe in manner" , "Lacking comforts; strict" .)