The most common and most likely answer to this crossword clue is the 6 letter word COILED
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More clues leading to the result COILED
Buddy explains!

The straight part
We know that "Wound up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wound up = coiled.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 COILED mean?
COILED verb- To wind or reel e.g. a wire or rope into regular rings, often around a centerpiece.
- To wind into loops (roughly) around a common center.
- To wind cylindrically or spirally.
- To encircle and hold with, or as if with, coils.
- In the form of coils; having coils.
- Prepared and poised to act, like a snake that has coiled its lower body so it can strike.