Thunder sound (4)

I believe the answer is:

clap

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

This is the entire clue.

(Other definitions for clap that I've seen before include "Pat" , "A meeting of hands" , "Express approbation with the hands" , "Strike hands together to applaud" , "Audibly show approval" .)

I've seen this clue in The Wall Street Journal, the USA Today, the LA Times, the King Feature Syndicate, the Penny Press, The Star Tribune and the Newsday.

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