Spartan, simple (7)
I believe the answer is:
austere
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">spartan</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that spartan can be written as austere)</span><br/ ><br/ >'<span class="explanation-format__original">simple</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for austere that I've seen before include "Severe in manner" , "Stern, severe" , "Severe; lacking luxuries" , "Grim - USA tree (anag)" , "Sure eat up and become without luxury" .)