Saucer-shaped bell (4)
I believe the answer is:
gong
'saucer-shaped bell' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gong that I've seen before include "Sound announcing meal" , "Resonant metal disc" , "Dinner chime or slangy medal" , "Dinner bell or slang medal" , "Medal; forty down" .)