Well-trained, I’d been to swimming (8)

I believe the answer is:

obedient

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'well-trained' is the definition.
Both the answer and definition are adjectives.
Maybe they are linked in a way I don't understand?

'i'd been to swimming' is the wordplay.
'swimming' is an anagram indicator (letters swim around into a new order).
'id'+'been'+'to'='idbeento'
'idbeento' anagrammed gives 'OBEDIENT'.

Can you help me to learn more?

(Other definitions for obedient that I've seen before include "Passive" , "co-operative?" , "Doing as one's told" , "Ready to agree" , "Complying with orders" .)

I've seen this clue in The Times.

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