Instructor leaves chapter? Not appropriate! (7)

I believe the answer is:

teacher

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'instructor' is the definition.
(synonyms)

'leaves chapter? not appropriate' is the wordplay.
'leaves' becomes 'tea' (as in tea leaves).
'chapter?' becomes 'ch'.
'not appropriate' becomes 'er' (I can't explain this - if you can you should give a lot more credence to this answer).
'tea'+'ch'+'er'='TEACHER'

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(Other definitions for teacher that I've seen before include "supply?" , "Pedagogue" , "Mentor" , "Schoolmaster/mistress" , "Guide" .)

I've seen this clue in The Hindu.

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