Explosive sound (4)

I think it could be either:

Which length description are you looking for?:

bang

'explosive sound' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for bang that I've seen before include "precisely" , "Slam" , "Sudden impact" , "Straight fringe of hair" , "Report - something the hairdresser did?" .)

I've seen this clue in The Sun and The Telegraph.

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