Wrap up piece of plumbing emerging from bathroom? (4,4)
I believe the answer is:
pipe down
'wrap' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for pipe down that I've seen before include "make less noise" , "Sh!" , "Shut up!" , "Stop talking" , "Be quiet!" .)