Hearing gong, interfere (6)
I believe the answer is:
meddle
'interfere' is the definition.
(meddling is a kind of interfering)
'hearing gong' is the wordplay.
'hearing' shows a homophone (sound like).
'gong' becomes 'medal' (I've seen this before).
'medal' sounds like 'MEDDLE'.
(Other definitions for meddle that I've seen before include "Interfere, butt in" , "Stick one's oar in" , "Interfere or tinker" , "Mess with" , "Interfere in other's business" .)