Glide across water with doubled force in boat (5)

I believe the answer is:

skiff

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'boat' is the definition.
(skiff is a kind of boat)

I can't explain the remainder of the clue.

(Other definitions for skiff that I've seen before include "Light rowing boat for one person" , "Small light boat" , "Small rowing boat" .)

I've seen this clue in The Times.

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