Swims slowly? (6)

I believe the answer is:

crawls

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'swims' is the definition.
(crawling is a kind of swimming)

I can't explain the rest of the clue.

(Other definitions for crawls that I've seen before include "Moves slowly with the body near the ground" , "'Moves slowly, near the ground (6)'" , "Creeps" , "Goes on all fours" .)

I've seen this clue in the Evening Standard.

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