Move like moths (4)
I believe the answer is:
flit
'move like moths' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for flit that I've seen before include "Secret departure (by moonlight?)" , "Flutter; run off" , "Move rapidly and lightly" , "Fly quickly (by moonlight?)" , "Move swiftly and lightly" .)