The most common and most likely answer to this crossword clue is the 9 letter word UNINSTALL
I've seen this crossword clue in The Times
U
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Buddy explains!

The straight part
We know that "to take off" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to take off = uninstall.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 UNINSTALL mean?
UNINSTALL noun- An uninstallation process.
- To completely remove hardware or software from a computer system.