The most common and most likely answer to this crossword clue is the 9 letter word THEREFORE
I've seen this crossword clue in Independent
T
H
E
R
E
F
O
R
E
More clues leading to the result THEREFORE
- Steer regularly seen around short cattle breed for this reason
- So English city mostly is covered by those on vacation
- Doctor to free her thus
- So the soldiers must go over front
- As a result of whistle-blower, the mineral deposit’s protected
- 15 So three, may be four say?
- Thus deleting conclusion of article before getting a word of warning
- As a result Whistler has nothing to enter at that point
- So free her to form a new group
- So supportive, when finished with drug
Buddy explains!

The straight part
We know that "As a result" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as a result = therefore.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 THEREFORE mean?
THEREFORE adverb- For that or this purpose, referring to something previously stated.
- Consequently, by or in consequence of that or this cause; referring to something previously stated.