Show some of convex polyhedron (4)

I believe the answer is:

expo

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

'some of convex polyhedron' is the wordplay.
'some of' indicates a hidden word.
'EXPO' is hidden within 'convex polyhedron'.

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

I've seen this clue in The Everyman puzzle in The Observer.

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