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One can learn from a trout when it's swimming (5)

Ross

I believe the answer is:

tutor

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

'swimming' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'one can learn from a trout when' is the wordplay.
'trout' anagrams to 'TUTOR'.
Though, I am not clear how the anagram is indicated.

'it's' is the link.

Can you help me to learn more?

(Other definitions for tutor that I've seen before include "Private instructor" , "Edify" , "Individual teacher" , "Private educator" , "Private or university teacher" .)

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