Move like a moth (4)
I believe the answer is:
flit
'move like a moth' 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 "Fly quietly and dartingly" , "Fly rapidly and lightly" , "Travel lightly and quickly" , "Decamp (by moonlight?)" , "Flutter - leave by moonlight?" .)