Crossword Genius

Teacher sounds less than assertive (3)

Ross

I believe the answer is:

sir

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'teacher' is the definition.
(way of addressing a male teacher)

I can't explain the rest of the clue.

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(Other definitions for sir that I've seen before include "Feted fellow" , "Male form of address" , "Title given to baronet" , "Title of knight or baronet" , "Term of address for a gentleman" .)

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