TV series seen in the bathroom (4)
I believe the answer is:
soap
'tv series' is the definition.
(soap opera is a type of TV series)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for soap that I've seen before include "Carbolic, perhaps" , "TV programme; cleanser" , "type of TV programme" , "Coronation Street?" , "cake?" .)