Crossword Genius

Large cosmic explosion (3,4)


I believe the answer is:

big bang

(Other definitions for big bang that I've seen before include "end for 1 across 12 [TRADING FLOOR]" , "Theoretically, the first thing" , "Universal beginning" , "major report" , "Gary -, Br. footballer" .)

I've seen this clue in The Sun.
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