The most common and most likely answer to this crossword clue is the 9 letter word QUIVERING
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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 QUIVERING mean?
QUIVERING verb- To shake or move with slight and tremulous motion; to tremble; to quake; to shudder; to shiver.
- A motion by which something quivers or trembles.
- Shaking, shivering