The most common and most likely answer to this crossword clue is the 10 letter word FRIGHTENED
I've seen this crossword clue in Independent
F
R
I
G
H
T
E
N
E
D
More clues leading to the result FRIGHTENED
Buddy explains!

The straight part
We know that "panicked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case panicked = frightened.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 FRIGHTENED mean?
FRIGHTENED verb- To cause to feel fear; to scare; to cause to feel alarm or fright.
- Afraid; suffering from fear.