Playful daughter opens sluice after wiping walls (5)

I believe the answer is:

ludic

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

I can't explain the rest of the clue.

(Other definitions for ludic that I've seen before include "Playful; lucid (anag.)" , "Playing aimlessly" .)

I've seen this clue in The Independent.

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