Crossword Genius

Preserve a large waterway (5)

Ross

I believe the answer is:

canal

'waterway' is the definition.
(I know that canal is a type of waterway)

'preserve a large' is the wordplay.
'preserve' becomes 'can' (canning is a kind of preserving).
'large' becomes 'L' (eg in clothes sizes).
'can'+'a'+'l'='CANAL'

(Other definitions for canal that I've seen before include "Manmade flower" , "Artificial waterway as at Panama (5)" , "Grand Union perhaps" , "Man-made strip of water" , "Long, narrow strip of water" .)

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