Cryptic crossword clue
Material seen through glasses, reportedly 7

The most common and most likely answer to this crossword clue is the 7 letter word PERSPEX

I've seen this crossword clue in The Daily Telegraph
P
E
R
S
P
E
X

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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 PERSPEX mean?

PERSPEX noun
  1. Any tough, transparent plastic that is used instead of glass for windows.

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