Insect attracted to light (4)
I believe the answer is:
moth
'insect attracted to light' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for moth that I've seen before include "Insect drawn to flame" , "Lepidopteran" , "Fairy like 13" , "Insect, mainly nocturnal" , "Cloth-eating larva" .)