The most common and most likely answer to this crossword clue is the 8 letter word LANDLINE
I've seen this crossword clue in The Times
L
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More clues leading to the result LANDLINE
Buddy explains!

The straight part
We know that "that facilitates communication" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that facilitates communication = landline.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 LANDLINE mean?
LANDLINE noun- A fixed telephone communications cable.
- (by extension) A telephone connected by such a fixed wire, specifically not wireless/mobile.
- That which is connected by such a fixed wire (telephone, internet etc.).