Crossword Genius

Big bang sound (4)

Ross

I believe the answer is:

boom

'big bang sound' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for boom that I've seen before include "Period of prosperity needed" , "Prosperous time -- rumbling sound" , "become suddenly prosperous" , "Prosper vigorously - waterway barrier" , "Bonanza; roar" .)

I've seen this clue in The Irish Times.
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