Thin; left over (5)
I believe the answer is:
spare
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">thin</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">left over</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 spare that I've seen before include "Leftover" , "Not required" , "Additional; thin" , "Let off; extra" , "In reserve; pardon" .)