Flame follower (4)
I believe the answer is:
moth
'flame follower' 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 "Insect of the order lepidoptera" , "Insect, mainly nocturnal" , "Night flier" , "One of 5 [FAIRIES]" , "Insect; MND fairy" .)