The most common and most likely answer to this crossword clue is the 8 letter word WELDMESH
W
E
L
D
M
E
S
H
Buddy explains!
The straight part
We know that "fencing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fencing = weldmesh.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 WELDMESH mean?
WELDMESH noun- A kind of barrier fencing manufactured in square or rectangular mesh from steel wire, welded at each intersection.