Bug spray (6,9)
I believe the answer is:
insect repellent
'bug spray' is the definition.
(I know that bug spray can be written as insect repellent)
This is all the clue.
(Other definitions for insect repellent that I've seen before include "Citronella, say" , "Lotion or spray against bites" , "It deters pest" , "flies away with this?" .)