Crossword Genius

Barrier for prosperity (4)

Ross

I believe the answer is:

boom

I believe this is a double definition.

'barrier' is the first definition.
(I've seen this before)

'prosperity' is the second definition.
(boom is a kind of prosperity)

'for' acts as a link.

(Other definitions for boom that I've seen before include "become suddenly prosperous" , "Loud noise - business increase" , "Pole for overhead microphone - deep sound" , "Deep hollow sound" , "pole attached to sail" .)

I've seen this clue in The Telegraph.
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