Transfers water into light shoes (5)

I believe the answer is:

pumps

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'light shoes' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for pumps that I've seen before include "Questions persistently; light shoes" , "needed by cyclists" , "footwear" , "Mechanical devices that move fluid or gas" , "Forces liquid to move; light shoes" .)

I've seen this clue in the Sydney Morning Herald.

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