The most common and most likely answer to this crossword clue is the 7 letter word FRETFUL
I've seen this crossword clue in The Times
F
R
E
T
F
U
L
More clues leading to the result FRETFUL
- Anxious as part of guitar not quite complete
- Worried, patching up fur with felt
- Worrying, having lines on neck?
- Dissatisfied with French flute going awry
- Irritable from French flute having become out of tune
- Tense, like a guitar neck?
- Anxious as guitar part not quite complete
- Upset father by breaking flute
Buddy explains!

The straight part
We know that "Anxious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anxious = fretful.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 FRETFUL mean?
FRETFUL adjective- Irritable, bad-tempered, grumpy or peevish.
- Unable to relax; fidgety or restless.