Crossword Genius

TV series seen in the bathroom (4)

Ross

I believe the answer is:

soap

I'm a little stuck... Click here to teach me more about this clue!

'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?" .)

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