Bathe with right weed (4)
I believe the answer is:
drip
'weed' is the definition.
(thesaurus)
'bathe with right' is the wordplay.
'bathe' becomes 'dip' (I am not sure about this - if you are sure you should believe this answer much more).
'with' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'dip' placed around 'r' is 'DRIP'.
Can you help me to learn more?
(Other definitions for drip that I've seen before include "Fall in small blobs" , "Gradual fall of liquid" , "Fall or let fall in drops" , "Means of intravenous feeding" , "Hospital equipment; weak person" .)