Crossword Genius

Display for announcer reporting traffic tailback? (7)

Ross

I believe the answer is:

autocue

'display for announcer' is the definition.
(displayed used by a presenter or announcer)

I don't understand how the remainder of the clue works.

(Other definitions for autocue that I've seen before include "TV prompt machine" , "Newsreader's prompt" , "TV prompt device" , "Newsreader's aid" , "Speaker's aid" .)

I've seen this clue in The Guardian.
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