Trout became new instructor (5)

I believe the answer is:

tutor

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'new instructor' is the definition.
'tutor' can be an answer for 'instructor' (tutor is a kind of instructor). I am unsure of the 'new' bit.

'trout became' is the wordplay.
'became' indicates an anagram (I've seen 'becomes' mean this).
'trout' anagrammed gives 'TUTOR'.

Can you help me to learn more?

(Other definitions for tutor that I've seen before include "Individual teacher" , "Give individual instruction" , "Edify" , "He shows us the way" , "Private educator" .)

I've seen this clue in The Mirror.

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