Minute mosquito-like fly (5)
I believe the answer is:
midge
'minute mosquito-like fly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for midge that I've seen before include "Tiny swarming fly" , "Tiny swarming insect" , "Small person" , "Small swarming biting insect" , "Tiny biting fly" .)