The most common and most likely answer to this crossword clue is the 11 letter word PLATE-GLASS
I've seen this crossword clue in Independent
P
L
A
T
E
-
G
L
A
S
S
More clues leading to the result PLATE-GLASS
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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 PLATE-GLASS mean?
PLATE-GLASS adjective- Made from plate glass