Tresses, locks (4)
I believe the answer is:
hair
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">tresses</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">locks</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(locks can mean hair)</span><br/ ><br/ ></span>
(Other definitions for hair that I've seen before include "Famous hirsute musical with song ` `Aquarius' ' (4)" , "Fuzz" , "Human head covering" , "Fur - mop" , "Outgrowth from the skin" .)