The shooting of some mosquitoes, we’re told (5)
I believe the answer is:
skeet
'the shooting' is the definition.
(skeet is a kind of shooting)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for skeet that I've seen before include "A form of clay-pigeon shooting" , "Form of clay pigeon shooting" , "American clay pigeon shooting" , "US version of a shooting sport involving clay pigeons" .)