Prince about to broadcast back in capital (8)

I believe the answer is:

pretoria

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'capital' is the definition.
(Pretoria is an example)

'prince about to broadcast back' is the wordplay.
'prince' becomes 'p'.
'about' becomes 're' (regarding).
'broadcast back' becomes 'ria' (I can't explain this - if you can you should believe this answer much more).
'p'+'re'+'to'+'ria'='PRETORIA'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pretoria that I've seen before include "Administrative capital of South African" , "Administrative capital of South Africa" , "City in South Africa" , "Pirate or, oddly, a South African city" , "Executive capital of South Africa" .)

I've seen this clue in The Telegraph.

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