Upbeat leaving beauty spot popular with number of children (4)

I believe the answer is:

toys

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'children' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for toys that I've seen before include "Plays (with something), not seriously" , "Film" , "Small dogs" , "Children's playthings" , "Things that provide amusement" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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