What does the cryptic crossword clue "Broadcast of TV show, Porridge for instance (6)" mean?

The definition is "Broadcast". The wordplay uses a homophone (sounds like). Sounds like (broadcast) ‘serial’ The answer is CEREAL.

Broadcast of TV show, Porridge for instance (6)

Guardian Cryptic #29557 | 25 Across | 2024-12-04 flower