It brings insects to a sticky end (8)
I believe the answer is:
flypaper
'it brings insects' is the definition.
The definition suggests a singular noun which matches the answer.
'a sticky end' is the wordplay.
I cannot really understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for flypaper that I've seen before include "pests will be caught by it" , "one collecting insects" , "should stick to the buzzer" , "Killer" , "Sticky insect trap" .)