Thanks for a wonderful set of clues - 28 from 15 entrants, including new entrant tatters (welcome!) - and for coping with my lowering of the tone!
I arrived at a short list of 3: seamus@8's clinic, ginge@9's cubicle, bbm2@15's bedpan ...
... and the winner is ginge@9 with:
Needing a wee means operating cubicle via one new pence (6,11)
Well done, ginge, your prize involves John Lennon:
https://m.youtube.com/watch?v=8iLbgMmxrK0
Enjoy!