Bathroom fitting is more splashy when I get in (6)

I believe the answer is:

shower

'bathroom fitting' is the definition.
(a bathroom is usually fitted with a shower)

I don't understand how the rest of the clue works.

(Other definitions for shower that I've seen before include "A brief fall of rain or a cleansing spray" , "Person demonstrating" , "Washing facility - worthless lot" , "One displaying - short spell of rain" , "Brief fall of rain or hail" .)

I've seen this clue in The Guardian.

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