Ban on singing in theatre momentarily retracted (6)

I believe the answer is:

omerta

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'ban on singing' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'in theatre momentarily retracted' is the wordplay.
'in' indicates a hidden word.
'retracted' is a reversal indicator.
'atremo' is hidden in the letters of 'theatre momentarily'.
'atremo' back-to-front is 'OMERTA'.

Can you help me to learn more?

(Other definitions for omerta that I've seen before include "Mafia pledge of silence" , "vow of silence" , "conspiracy of silence" , "Mafia code of silence; at Rome (anag.)" , "Mafia code of silence, never inform" .)

I've seen this clue in The Times.

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