Busybody sounds like a winner (7)
I believe the answer is:
meddler
'busybody' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for meddler that I've seen before include "One who interferes" , "One interfering" , "Interferer" , "One tampering" , "Interfering person" .)