Rests, heading off annoying insects (4)
I believe the answer is:
lies
'rests' is the definition.
(lying is a kind of resting)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for lies that I've seen before include "golfing situations" , "Wallows" , "Reclines" , "Assumes a horizontal position" , "Untruths" .)