A little engraving on gold medal (4)
I believe the answer is:
gong
'medal' is the definition.
(informal term for a medal or prize)
'a little engraving on gold' is the wordplay.
'a little' indicates the answer is hidden within the clue (a little bit of the clue).
'GONG' is hidden within 'engraving on gold'.
(Other definitions for gong that I've seen before include "Dinner bell or slangy medal" , "Source of summons" , "Wordsworth's Boy; Dostoevsky's hero" , "Kind of bell sounded for dinner" , "Round metal plate struck to resound" .)