Crossword Genius

Prompter, if traffic jam reported? (7)

Ross

I believe the answer is:

autocue

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'prompter' is the definition.
(I know that prompter can be written as autocue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for autocue that I've seen before include "Hidden screen showing the script to a speaker" , "TV presenter's line-feeder" , "TV prompter" , "Newsreader's aid" , "TV prompt machine" .)

I've seen this clue in The Independent.
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