What broadcasters may use in traffic tailback, do we hear? (7)

I believe the answer is:

autocue

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'what broadcasters may use in traffic tailback do we hear?' is the definition.
The definition suggests a singular noun which matches the answer.

'traffic tailback do we hear?' is the wordplay.
'traffic' becomes 'auto' (I can't justify this - if you can you should give a lot more credence to this answer).
'tailback' becomes 'queue' (I've seen this before).
'do we hear?' shows a homophone (sound like).
'queue' is a homophone of 'cue'.
'auto'+'cue'='AUTOCUE'

Can you help me to learn more?

(Other definitions for autocue that I've seen before include "Vocal prompter" , "Prompting device for a speaker" , "TV signal" , "TV studio device" , "TV prompter" .)

I've seen this clue in The Times.

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