Toll (5)
(Other definitions for chime that I've seen before include "Agree (with); ring" , "Struck bell" , "Clang" , "Tuned bell" , "(Bell) sound the hour" .)
'toll' is the definition.
(I know that knell is a type of toll)
This is the entire clue.
(Other definitions for knell that I've seen before include "Toll, ring" , "Sound of tolling bell" , "Funereal bell sound" , "Solemn sound of a bell" , "Solemn warning" .)