Crossword Genius

Key from a ring? (5)

Ross

I believe the answer is:

atoll

'key' is the definition.
(thesaurus)

'a ring?' is the wordplay.
'ring?' becomes 'toll' (tolling is a kind of ringing).
'a'+'toll'='ATOLL'

'from' is the link.

(Other definitions for atoll that I've seen before include "String of islands" , "Bikini for one" , "Bikini, say" , "Ring-shaped coral reef enclosing a lagoon" , "Coral island with central lagoon" .)

I've seen this clue in The Telegraph.
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