Insect, one buzzing let out (6)
I believe the answer is:
beetle
'insect' is the definition.
(I know that beetle is a type of insect)
'one buzzing let out' is the wordplay.
'one buzzing' becomes 'beet' (I can't justify this - if you can you should believe this answer much more).
'out' means to remove the last letter.
'let' with its last letter taken off is 'le'.
'beet'+'le'='BEETLE'
Can you help me to learn more?
(Other definitions for beetle that I've seen before include "pest" , "Insect (from Colorado?)" , "Scarab, say?" , "crusher" , "... after {STATE = COLORADO] which he'll do for Charlotte" .)