Thin; without fat (4)
I believe the answer is:
lean
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">thin</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that thin can be written as lean)</span><br/ ><br/ >'<span class="explanation-format__original">without fat</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for lean that I've seen before include "Unproductive" , "With no fat; slope" , "Meagre" , "Current update (colloq.)" , "Tend towards being thin" .)