The most common and most likely answer to this crossword clue is the 8 letter word TELEGRAM
T
E
L
E
G
R
A
M
More clues leading to the result TELEGRAM
- Message Marjorie allowed to be returned
- 6 Mrs Simpson allowed to circulate urgent message
- Message spread, allowed to be written about
- Closure of mainline journey section in public transport message
- Explain cut on, say, farm animal? Wire
- Message spread caused upset
- Periodically they’ll spread revolutionary message
- English set about interrupting public transport message
- Doctor met with large message
- Message left in note, eg “Castle in the morning”
Buddy explains!

The straight part
We know that "Cable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cable = telegram.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 TELEGRAM mean?
TELEGRAM noun- A message transmitted by telegraph.
- To send a telegram.
- To send a telegram to (a person).
- To send (a message) in a telegram.