Crossword Genius

Teacher sounds a bit surly (3)

Ross

I believe the answer is:

sir

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

'sounds a bit surly' is the wordplay.
'a bit' indicates taking the first letters (I've seen 'bit of' mean this).
'surly' becomes 'ir' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'sounds' is 's'.
's'+'ir'='SIR'

Can you help me to learn more?

(Other definitions for sir that I've seen before include "Term of address for a gentleman" , "Polite term of address for a man" , "Male title of respect" , "Polite or formal address to male" , "Noble title of undesirable kind" .)

I've seen this clue in the Evening Standard.
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