Crossword Genius

Teacher said to go in a circle (3)

Ross

I believe the answer is:

sir

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

I don't understand how the remainder of the clue works.

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(Other definitions for sir that I've seen before include "address to teacher" , "Way to address gentleman" , "Polite term of address for a man" , "Respectful address for a man" , "Title for knight or teacher" .)

I've seen this clue in the Evening Standard.
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