The most common and most likely answer to this crossword clue is the 7 plus 4 letter word WROUGHT IRON
I've seen this crossword clue in Financial Times
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More clues leading to the result WROUGHT IRON
Buddy explains!
The straight part
We know that "fencing material" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fencing material = wrought iron.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 WROUGHT IRON mean?
WROUGHT IRON adjective- Made from wrought iron