Boat is slower, taken separately (4)

I believe the answer is:

scow

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

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

(Other definitions for scow that I've seen before include "ighter" , "Unpowered freight barge" , "Wide-beamed dinghy" , "Maybe lighter" , "Low boat" .)

I've seen this clue in The Hindu.

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