Crossword Genius

Period of prosperity (4)

Ross

I believe the answer is:

boom

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

This is the entire clue.

(Other definitions for boom that I've seen before include "Dull explosion; prosperous period" , "Noise of large explosion" , "Resonant sound < of TV equipment" , "Resound - spar - economic growth" , "It may protect harbour" .)

I've seen this clue in The Telegraph and The Wall Street Journal.
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