Sudden noise? Exactly (4)

I believe the answer is:

bang

This clue is a double definition.

'sudden noise?' is the first definition.

'exactly' is the second definition.
(thesaurus)

(Other definitions for bang that I've seen before include "Sudden impact" , "Strike violently" , "Explosive noise" , "Report - something the hairdresser did?" , "Sudden loud noise (often 'big')" .)

I've seen this clue in The Times.

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