Teaching trout? About time (8)
I believe the answer is:
tutorage
'teaching' is the definition.
(I have seen 'Personal teaching ' mean 'tutorage' so perhaps 'teaching' could also mean 'tutorage')
'trout? about time' is the wordplay.
'about' indicates anagramming the letters.
'time' becomes 'age' (an age is a period of time).
'trout' is an anagram of 'tutor'.
'tutor'+'age'='TUTORAGE'
(Other definitions for tutorage that I've seen before include "Instruction" , "Personal teaching" .)