Loud insect circling wood (6)
I believe the answer is:
flashy
'loud' is the definition.
(I know that loud can be written as flashy)
'insect circling wood' is the wordplay.
'insect' becomes 'fly' (fly is a kind of insect).
'circling' is an insertion indicator (circling can mean going around or containing).
'wood' becomes 'ash' (wood from an ash tree).
'fly' enclosing 'ash' is 'FLASHY'.
(Other definitions for flashy that I've seen before include "Showily stylish" , "Loud" , "Vulgar" , "Ostentatious - glittering" , "Cheap and showy" .)