TV or radio series (4,5)
(Other definitions for soap opera that I've seen before include "TV serial such as Coronation Street" , "that might involve The Woolpack?" , "Sentimental TV serial, sounds clean" , "TV programme" , "Everyday drama serial" .)
(Other definitions for sitcom that I've seen before include "Friends, for example" , "Shortened form of situation comedy" , "'Humorous drama based on situations, in short (6)'" , "Light-hearted TV series" , "TV series (colloq.)" .)