Kids one ensures will have a nap (6)

I believe the answer is:

teases

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'kids' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for teases that I've seen before include "baits" , "'Makes fun of, playfully (6)'" , "Vexes playfully" , "is tantalising" , "Makes fun of in a playful way" .)

I've seen this clue in the Evening Standard.

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