Result of a mosquito bite (4)
I believe the answer is:
itch
'result of a mosquito bite' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for itch that I've seen before include "A strong restless desire" , "Irritating feeling on the skin" , "Skin irritation" , "great desire" , "Tickle; urge" .)