Crossword Genius

One expects the artist to hold the boat? (7)

Ross

I believe the answer is:

painter

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for painter that I've seen before include "Eg, Constable" , "Shipping line" , "craft tied up with this" , "Line attached to the bow of a boat when tying up" , "Artist - rope for boat" .)

I've seen this clue in The Irish News.
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