Fish prepared for tutor (5)

I believe the answer is:

trout

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

'fish' is the definition.
(I know that trout is a type of fish)

'prepared for tutor' is the wordplay.
'tutor' can be anagrammed to 'TROUT'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for trout that I've seen before include "Fish (associated with Schubert?)" , "air" , "Unattractive old woman" , "Freshwater game fish" , "Tasty fish, perhaps of rainbow kind" .)

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