Trout grilled for teacher (5)
I believe the answer is:
tutor
'for teacher' is the definition.
(tutor is a kind of teacher)
'trout grilled' is the wordplay.
'grilled' indicates an anagram.
'trout' anagrammed gives 'TUTOR'.
(Other definitions for tutor that I've seen before include "Personal teacher" , "He shows us the way" , "Personal coach" , "Edify" , "trainer" .)