The most common and most likely answer to this crossword clue is the 4 plus 3 letter word TURN OFF
I've seen this crossword clue in The Daily Telegraph
T
U
R
N
O
F
F
Buddy explains!

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 TURN OFF mean?
TURN OFF noun- Something that repulses, disgusts, or discourages, especially sexually.
- A road where one turns off, such as a motorway exit.