People who demonstrate bathroom facilities? (7)
I believe the answer is:
showers
This clue is a double definition.
'people who demonstrate' is the first definition.
(people who show or demonstrate)
'bathroom facilities?' is the second definition.
(showers are found in bathrooms)
(Other definitions for showers that I've seen before include "Brief periods of precipitation" , "Exhibitionists" , "Spots of rain" , "She rows (anag.)" , "Washes over" .)