Toll of a bell (5)
I believe the answer is:
knell
'toll of a bell' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for knell that I've seen before include "Toll (bell)" , "Sound of funeral bell" , "Temperate" , "Funeral-bell" , "Solemnly proclaim death" .)