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The French, OK, are into fizzy water in abundance (4,7)

Ross

I believe the answer is:

lake ontario

'water in abundance' is the definition.
(one of the Great Lakes)

'the french ok are into fizzy' is the wordplay.
'the french' becomes 'la' ('the' in French).
'fizzy' is an anagram indicator.
'ok'+'are'+'into'='okareinto'
'okareinto' with letters rearranged gives 'keontario'.
'la'+'keontario'='LAKE ONTARIO'

I've seen this clue in The Everyman puzzle in The Observer.
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