Crossword Genius

One demonstrating bathroom installation (6)

Ross

I believe the answer is:

shower

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'one demonstrating' is the definition.
(somebody showing something)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for shower that I've seen before include "Downpour, in April say" , "Light rainfall" , "Sprinkle" , "Pelt" , "Something depicting" .)

I've seen this clue in The Times.
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