The most common and most likely answer to this crossword clue is the 9 letter word DISAFFECT
I've seen this crossword clue in Financial Times
D
I
S
A
F
F
E
C
T
Buddy explains!

The straight part
We know that "turn away" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case turn away = disaffect.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 DISAFFECT mean?
DISAFFECT verb- To cause a loss of affection, sympathy or loyalty in; to alienate or estrange.