Fly away after using this spray? (6,9)
I believe the answer is:
insect repellent
'away after using this spray?' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'fly' is the wordplay.
I cannot really understand how this works, but
'fly' could be 'insect' (insect is a type of fly) and 'insect' is present in the answer.
The remaining letters 'repellent' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for insect repellent that I've seen before include "Lotion or spray against bites" , "Citronella, say" , "flies away with this?" , "It deters pest" .)