The most common and most likely answer to this crossword clue is the 8 letter word AUTOCUES
I've seen this crossword clue in The Daily Telegraph
A
U
T
O
C
U
E
S
More clues leading to the result AUTOCUES
Buddy explains!

The straight part
We know that "TV presenter prompts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tv presenter prompts = autocues.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AUTOCUES mean?
AUTOCUES noun- Any of several devices that display words for a person to read aloud