Delicate strand (4)
I believe the answer is:
wisp
'delicate strand' is the definition.
(I've seen this before)
This is the entire clue.
(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" .)