Young swimmers playing old tapes (8)

I believe the answer is:

tadpoles

I'm a little stuck... Click here to teach me more about this clue!

'young' is the definition.
(I have seen 'Young of frogs ' mean 'tadpoles' so perhaps 'young' could also mean 'tadpoles')

'swimmers playing old tapes' is the wordplay.
'old tapes' can be anagrammed to 'TADPOLES'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for tadpoles that I've seen before include "Baby frogs" , "Larvae of frogs or toads" , "Larval frogs" , "Pond-life" , "Little swimmers" .)

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