Crossword Genius

Teacher, on reflection, is right (3)

Ross

I believe the answer is:

sir

'teacher' is the definition.
(I've seen this before)

'reflection is right' is the wordplay.
'reflection' is a reversal indicator.
'right' becomes 'r' (common abbreviation).
'is' in reverse letter order is 'si'.
'si'+'r'='SIR'

'on' is the link.

(Other definitions for sir that I've seen before include "Term of address for a gentleman" , "Gentleman's form of address" , "Polite or formal address to male" , "Title of 1 across" , "Knight's title" .)

I've seen this clue in The Times.
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