Delicate strand (4)
I believe the answer is:
wisp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">delicate strand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for wisp that I've seen before include "Thin strand, of smoke say" , "Small thin line of cloud or smoke" , "Shred" , "Light streak of smoke or stray hair" , "Thin girl" .)