Crossword Genius

Can a mere learner navigate on one? (5)


I believe the answer is:


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'navigate on one?' is the definition.
I can't tell whether this definition defines the answer.

'can a mere learner' is the wordplay.
'mere learner' becomes 'l' (as in a learner driver with L-plates on their car. I am not sure about the 'mere' bit.).

Can you help me to learn more?

(Other definitions for canal that I've seen before include "Duct" , "Manmade flower" , "navigate this?" , "Man-made waterway" , "Inland waterway" .)

I've seen this clue in the Evening Standard.
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