Rail scoop for broadcast in Greek citadel (9)

I believe the answer is:

acropolis

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

'greek citadel' is the definition.
(I've seen this before)

'rail scoop for broadcast' is the wordplay.
'rail scoop' can be anagrammed to 'ACROPOLIS'.
Though, I'm not clear how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for acropolis that I've seen before include "Large old building" , "Ancient citadel of Athens" , "Greek tourist spot" , "old citadel" , "Citadel of ancient Greece" .)

I've seen this clue in The Sun.

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.