Crossword Genius

Circular belt of gas (5)

Ross

I believe the answer is:

ozone

'gas' is the definition.
(I know that ozone is a type of gas)

'circular belt' is the wordplay.
'circular' becomes 'o' (I've seen this in other clues).
'belt' becomes 'zone' (I've seen this before).
'o'+'zone'='OZONE'

'of' is the link.

(Other definitions for ozone that I've seen before include "invigorating British air" , "Bracing seaside air" , "Gas that screens ultraviolet radiation" , "Allotropic gas" , "A poisonous gas; seaside air" .)

I've seen this clue in The Globe and Mail.
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