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' anagrams to 'TADPOLES'.
Though, I'm unsure how the anagram 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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