Teacher's audible disapproval on gold (5)

I believe the answer is:

tutor

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

'audible disapproval on gold' is the wordplay.
'audible disapproval' becomes 'tut' (I have seen 'Express disapproval' mean 'tut' so perhaps 'disapproval' could also mean 'tut'. I am not sure about the 'audible' bit.).
'on' says to put letters next to each other.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'tut'+'or'='TUTOR'

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(Other definitions for tutor that I've seen before include "Give individual instruction" , "class leader" , "Personal coach" , "train" , "Mentor" .)

I've seen this clue in The Daily Express.

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