The most common and most likely answer to this crossword clue is the 8 letter word JITTERED
J
I
T
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E
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E
D
Buddy explains!

The straight part
We know that "Was nervous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was nervous = jittered.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 JITTERED mean?
JITTERED verb- To be nervous.
- (data visualization) To randomly position of data points to avoid visual overlap.