Bath water? (4)
I believe the answer is:
avon
'bath water?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avon that I've seen before include "Shakespeare was known as the Bard of . . . ." , "River flowing through Bristol to the Severn" , "Name of several English rivers" , "River joining Bath with Bristol" , "English river name in multiple use" .)