The most common and most likely answer to this crossword clue is the 11 letter word TREPIDATION
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More clues leading to the result TREPIDATION
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The straight part
We know that "trembling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trembling = trepidation.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 TREPIDATION mean?
TREPIDATION noun- A fearful state; a state of concern or hesitation.
- An involuntary trembling, sometimes an effect of paralysis, but usually caused by terror or fear; quaking; quivering.
- A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars.