The most common and most likely answer to this crossword clue is the 7 letter word KNOTTED
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More clues leading to the result KNOTTED
Buddy explains!

The straight part
We know that "Bound" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bound = knotted.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 KNOTTED mean?
KNOTTED verb- To form into a knot; to tie with a knot or knots.
- To form wrinkles in the forehead, as a sign of concentration, concern, surprise, etc.
- To unite closely; to knit together.
- To entangle or perplex; to puzzle.
- To form knots.
- To knit knots for a fringe.
- Full of knots; knotty.
- Tied in knots.
- Tangled, tangly, knotty, entangled, matted, snarled, unkempt, or uncombed.