Gong banged finally, dinner say brought round? (5)
I believe the answer is:
medal
'gong' is the definition.
(gong can mean a prize or medal)
'banged finally dinner say brought round?' is the wordplay.
'finally' says to take the final letters.
'dinner say' becomes 'meal' (dinner is a kind of meal).
'brought round?' is an insertion indicator.
The last letter of 'banged' is 'd'.
'd' put within 'meal' is 'MEDAL'.
(Other definitions for medal that I've seen before include "Religious or commemorative pin" , "Lamed by award" , "Commemorative disc" , "Award for distinction" , "Award for the soldier" .)