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

The straight part
We know that "Worrying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worrying = disturbing.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 DISTURBING mean?
DISTURBING verb- To confuse a quiet, constant state or a calm, continuous flow, in particular: thoughts, actions or liquids.
- To divert, redirect, or alter by disturbing.
- To have a negative emotional impact; to cause emotional distress or confusion.
- Causing distress or worry; upsetting or unsettling.