Soak in the tub (5)
I believe the answer is:
bathe
'soak in 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 "plunge" , "Immerse oneself in water" , "Become immersed in" , "Take a swim; envelop" , "bit of swimming" .)