Crossword Genius

Island in the form of a ring (5)

Ross

I believe the answer is:

atoll

'island' is the definition.
(I know that atoll is a type of island)

'a ring' is the wordplay.
'ring' becomes 'toll' (ring a bell).
'a'+'toll'='ATOLL'

'in the form of' acts as a link.

(Other definitions for atoll that I've seen before include "Coral island(s) surrounding a lagoon" , "Land around a lagoon, such as Bikini" , "Pacific coral island" , "tropical paradise?" , "Allot (anag.)" .)

I've seen this clue in The Telegraph and The Guardian.
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