Crossword Genius

Prosperous period (4)

Ross

I believe the answer is:

boom

'prosperous period' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for boom that I've seen before include "time of 22 [PROSPERITY]" , "Period of prosperity needed" , "Deep sound; spar" , "Deep and resonant sound" , "Resound - spar - economic growth" .)

I've seen this clue in the USA Today, The Times, the King Feature Syndicate and The Sun.
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