Swimming lesson includes introductions to requisite kids' breathing equipment (8)

I believe the answer is:

snorkels

'breathing equipment' is the definition.

'swimming lesson includes introductions to requisite kids'' is the wordplay.
'swimming' is an anagram indicator.
'includes' indicates putting letters inside.
'introductions to' suggests taking the first letters.
The first letters of 'requisite kids' is 'rk'.
'lesson' is an anagram of 'snoels'.
'snoels' enclosing 'rk' is 'SNORKELS'.

(Another definition for snorkels that I've seen is " Breathing devices for swimmers".)

I've seen this clue in The Telegraph.

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