Interfere in honour, we hear (6)
I believe the answer is:
meddle
'interfere in' is the definition.
(I've seen this before)
'honour we hear' is the wordplay.
'honour' becomes 'medal' (medal is a kind of honour).
'we hear' indicates a 'sounds like' (homophone) clue.
'medal' is a homophone of 'MEDDLE'.
(Other definitions for meddle that I've seen before include "Interfere in someone else's business" , "Interfere in other's business" , "Stick one's oar in" , "Interfere unnecessarily" , "Intrude, interfere" .)