Help for presenter in traffic jam, we hear? (7)
I believe the answer is:
autocue
'help for presenter' is the definition.
(device giving a TV presenter their lines)
I can't explain the remainder of the clue.
(Other definitions for autocue that I've seen before include "Speaker's prompt device" , "TV presenting aid" , "Newsreader's aid" , "Hidden screen showing the script to a speaker" , "TV prompt device" .)