Crossword Genius

Teacher’s disapproving expression: nothing right! (5)

Ross

I believe the answer is:

tutor

'teacher's' is the definition.
(tutor is a kind of teacher)

'disapproving expression nothing right' is the wordplay.
'disapproving expression' becomes 'tut' (tut tut!).
'nothing' becomes 'O' (looks like zero - 0).
'right' becomes 'r' (abbreviation).
'tut'+'o'+'r'='TUTOR'

(Other definitions for tutor that I've seen before include "train" , "Individual teacher" , "Private educator" , "Master" , "Private instructor" .)

I've seen this clue in The Times.
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