Butterfly's kin (4)
I believe the answer is:
moth
'butterfly's kin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for moth that I've seen before include "night flyer" , "Cloth-eating larva" , "Lepidopteran" , "Insect attracted to light" , "Night flying insect" .)