Flow from it's absence in the bathroom? (5)
I believe the answer is:
ensue
'flow from' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ensue that I've seen before include "Leading directly to" , "Happen or come about as consequence" , "Result in a particular way" , "Come about, result in" , "Follow as a consequence" .)