A noisy summer insect (6)
I believe the answer is:
cicada
'a noisy summer insect' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cicada that I've seen before include "Noisy tropical insect" , "six-footer?" , "Stridulating insect" , "Shrill insect" , "Noisy bug" .)