Light-loving insect (4)
I believe the answer is:
moth
'light-loving insect' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moth that I've seen before include "Usually nocturnal insect" , "One of 5 [FAIRIES]" , "Night flier" , "Nocturnal winged insect" , "Night flying insect" .)