Lean or narrow (4)
I believe the answer is:
thin
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lean</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that lean can be written as thin)</span><br/ ><br/ >'<span class="explanation-format__original">narrow</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ ></span>
(Other definitions for thin that I've seen before include "With little thickness" , "Sparse; not dense" , "Having little width" , "Carrying little fat" , "Slender, slight" .)