Canoe gets thrown about in large body of water (5)

I believe the answer is:

ocean

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'large body of water' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for ocean that I've seen before include "Immense expanse or quantity" , "The deep" , "Large expanse of water" , "eg Indian, Pacific" , "Quantity of water" .)

I've seen this clue in The Hindu.

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