Trout, swimming around, can be instructive (5)

I believe the answer is:

tutor

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'can be instructive' is the definition.
I can't judge whether this definition defines the answer.

'trout swimming' is the wordplay.
'swimming' indicates an anagram.
'trout' with letters rearranged gives 'TUTOR'.

'around' acts as a link.

Can you help me to learn more?

(Other definitions for tutor that I've seen before include "Mentor" , "School" , "Teach" , "Personal teacher" , "train" .)

I've seen this clue in the Evening Standard.

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