Spartan (7)
I believe the answer is:
austere
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spartan</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)