Shown up in camera? (7)

I believe the answer is:

exposed

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

I don't understand the remainder of the clue.

(Other definitions for exposed that I've seen before include "at mercy of weather" , "With no protection or shield" , "Made public" , "Laid bare" , "Uncovered, visible" .)

I've seen this clue in the Evening Standard.

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