Crossword Genius

Show bombshell with casing removed (4)

Ross

I believe the answer is:

expo

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'show' is the definition.
(short for exposition, a large exhibition)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for expo that I've seen before include "Large international exhibition" , "World fair, e.g. Seville 1992" , "Show" , "Large international fair" , "Major international fair" .)

I've seen this clue in The Independent.
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