Tutor confusing hectare and the acre! (7)

I believe the answer is:

teacher

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'tutor' is the definition.
(tutor is a type of teacher)

'confusing hectare and the acre' is the wordplay.
'hectare' anagrams to 'TEACHER'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for teacher that I've seen before include "One who might give lines" , "Lecturer" , "'Instructor, educator (7)'" , "Mentor" , "CARRY ON FILM" .)

I've seen this clue in The Telegraph.

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