Crossword Genius

A tax on some reef (5)

Ross

I believe the answer is:

atoll

'some reef' is the definition.
(atoll is a kind of reef)

'a tax on' is the wordplay.
'tax' becomes 'toll' (I've seen this in other clues).
'on' means one lot of letters go next to another.
'a'+'toll'='ATOLL'

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

I've seen this clue in the Sydney Morning Herald.
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