The most common and most likely answer to this crossword clue is the 8 letter word PATCHING
I've seen this crossword clue in The Daily Telegraph
P
A
T
C
H
I
N
G
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 = patching.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 PATCHING mean?
PATCHING verb- To mend by sewing on a piece or pieces of cloth, leather, or the like
- To mend with pieces; to repair by fastening pieces on.
- To make out of pieces or patches, like a quilt.
- To join or unite the pieces of; to patch the skirt.
- To employ a temporary, removable electronic connection, as one between two components in a communications system.
- (generally with the particle "up") To repair or arrange in a hasty or clumsy manner
- To make the changes a patch describes; to apply a patch to the files in question. Hence:
- To connect two pieces of electrical equipment using a cable.
- The act of one who patches.