Honour duke in middle of dinner perhaps (5)
I believe the answer is:
medal
'honour' is the definition.
(medal is a kind of honour)
'duke in middle of dinner perhaps' is the wordplay.
'duke' becomes 'd'.
'in middle of' is an insertion indicator.
'dinner perhaps' becomes 'meal' (dinner is a kind of meal).
'd' inserted inside 'meal' is 'MEDAL'.
(Other definitions for medal that I've seen before include "Piece of metal as award or in commemoration" , "George Cross, for instance" , "Religious or commenorative metal piece" , "Metal disc given as award" , "Award for distinction" .)