Crossword Genius

Paddle round top of ocean? (4)

Ross

I believe the answer is:

boat

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'paddle' is the first definition.
(I know that boat is the is a more specific form of the action of paddle.)

'round top of ocean?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for boat that I've seen before include "Contest on the Thames" , "Vehicle for travelling over water" , "See 18" , "See 1" , "Water craft" .)

I've seen this clue in The Telegraph.
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