Use the tub (5)
I believe the answer is:
bathe
'use the tub' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bathe that I've seen before include "Wash; swim" , "Steep" , "Bask" , "Swim for pleasure, and clean oneself" , "Take a swim; envelop" .)