The most common and most likely answer to this crossword clue is the 9 letter word REPAIRING
I've seen this crossword clue in The Daily Telegraph
R
E
P
A
I
R
I
N
G
More clues leading to the result REPAIRING
Buddy explains!
The straight part
We know that "Fixing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fixing = repairing.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 REPAIRING mean?
REPAIRING verb- To restore to good working order, fix, or improve damaged condition; to mend; to remedy.
- To make amends for, as for an injury, by an equivalent; to indemnify for.
- To transfer oneself to another place.
- To pair again
- The act by which something is repaired; a mending.