Insect flying etc around stack of hay (7)
I believe the answer is:
cricket
'insect' is the definition.
(I know that cricket is a type of orthopteran)
'flying etc around stack of hay' is the wordplay.
'flying' is an anagram indicator (letters fly around into new positions).
'around' is an insertion indicator.
'stack of hay' becomes 'rick' (I've seen this in another clue).
'etc' is an anagram of 'cet'.
'cet' going around 'rick' is 'CRICKET'.
(Other definitions for cricket that I've seen before include "Insect with long leg" , "Six-footer" , "Game - "basically baseball on Valium" (Robin Williams)" , "English game or chirping insect" , "Summer sport" .)