Insect repellent affected type of wasp dodging net (7)
I believe the answer is:
camphor
'insect repellent' is the definition.
(substance used as an insect repellent)
'affected type of wasp dodging net' is the wordplay.
'affected' becomes 'camp' (camp can mean exaggerated or affected).
'type of wasp' becomes 'hornet'.
'dodging' is a deletion indicator.
'hornet' with 'net' taken out is 'hor'.
'camp'+'hor'='CAMPHOR'
(Other definitions for camphor that I've seen before include "Compound" , "Substance that repels moths" , "Moth repellent" , "Aromatic substance that repels insects" , "Constituent of mothballs" .)