Plaything for well balanced children (6)

I believe the answer is:

seesaw

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'plaything' is the definition.
(seesaw is a kind of plaything)

I don't understand the rest of the clue.

(Other definitions for seesaw that I've seen before include "vacillate in policy" , "entertainment for children" , "Fluctuating playground ride" , "pitch" , "Plaything that's ridden up and down" .)

I've seen this clue in the Evening Standard.

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