The most common and most likely answer to this crossword clue is the 9 letter word ANXIOUSLY
I've seen this crossword clue in The Guardian
A
N
X
I
O
U
S
L
Y
More clues leading to the result ANXIOUSLY
Buddy explains!

The straight part
We know that "with nerves" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with nerves = anxiously.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 ANXIOUSLY mean?
ANXIOUSLY adverb- In an anxious manner; with painful uncertainty; solicitously.