Teacher cooks trout
I believe the answer is:
tutor
'teacher' is the definition.
(tutor is a kind of teacher)
'cooks trout' is the wordplay.
'cooks' indicates anagramming the letters.
'trout' with letters rearranged gives 'TUTOR'.
(Other definitions for tutor that I've seen before include "train" , "Give individual instruction" , "He shows us the way" , "college teacher" , "class leader" .)