The most common and most likely answer to this crossword clue is the 10 letter word ABSTAINING
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More clues leading to the result ABSTAINING
Buddy explains!

The straight part
We know that "Staying away" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case staying away = abstaining.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 ABSTAINING mean?
ABSTAINING verb- Keep or withhold oneself.
- Refrain from (something or doing something); keep from doing, especially an indulgence.
- Fast (not eat for a period).
- Deliberately refrain from casting one's vote at a meeting where one is present.
- Hinder; keep back; withhold.