Crossword Genius

Single sound of bell's ring, in the main (5)

Ross

I believe the answer is:

atoll

'ring in the main' is the definition.
(ring-shaped reef - the main can mean the sea)

'single sound of bell's' is the wordplay.
'single' becomes 'a'.
'sound of bell' becomes 'toll' (a bell tolls).
'a'+'toll'='ATOLL'

(Other definitions for atoll that I've seen before include "land threatened by rising sea levels" , "String of islands" , "Circular coral reef" , "Bikini for one" , "tropical paradise?" .)

I've seen this clue in The Times.
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