The most common and most likely answer to this crossword clue is the 9 letter word IMPLANTED
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More clues leading to the result IMPLANTED
Buddy explains!

The straight part
We know that "fixed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fixed = implanted.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 IMPLANTED mean?
IMPLANTED verb- To fix firmly or set securely or deeply.
- To insert (something) surgically into the body.
- Of an embryo, to become attached to and embedded in the womb.