Prominent expert with tirade about television (11)

I believe the answer is:

protuberant

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

'prominent expert with tirade about television' is the definition.
I can't tell whether this definition defines the answer.

'prominent expert with tirade about' is the wordplay.
'prominent' becomes 'tube' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'expert' becomes 'pro' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'tirade' becomes 'rant' (I've seen this before).
'about' means one lot of letters goes inside another.
'pro'+'rant'='prorant'
'tube' going into 'prorant' is 'PROTUBERANT'.

Can you help me to learn more?

(Other definitions for protuberant that I've seen before include "Outstanding" , "Sticking out" , "Proud" , "Bulging" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.