Reckons they're very young (4)

I believe the answer is:

tots

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'young' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for tots that I've seen before include "Little children" , "Party drinks" , "Babies" , "Young children - shorts" , "Sailors' drams" .)

I've seen this clue in the Evening Standard.

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