The most common and most likely answer to this crossword clue is the 7 letter word ENABLER
I've seen this crossword clue in Independent
E
N
A
B
L
E
R
More clues leading to the result ENABLER
Buddy explains!

The straight part
We know that "One facilitates" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one facilitates = enabler.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 ENABLER mean?
ENABLER noun- One who or that which helps something to happen.
- One who encourages a bad habit in another (typically drug addiction) by their behaviour.
- One who gives someone else the power to behave in a certain way.