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Teacher, possibly, avoiding time in jail (3)


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'teacher possibly' is the definition.
(a male teacher might be addressed as 'sir')

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(Other definitions for sir that I've seen before include "Polite form of address to a man" , "... ___ John Major" , "Title of 1 across" , "Feted fellow" , "Term of address for a gentleman" .)

I've seen this clue in The Times.
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