Paradise for the large part is swell (5)

I believe the answer is:

heave

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'is swell' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for heave that I've seen before include "Lift or throw with great effort" , "Produce (a sigh); lift" , "Pitch" , "gag" , "Throw; haul by rope (naut.)" .)

I've seen this clue in The Times.

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