5 across
Light
material
suffering
more
snags
if
not
new
(8)
Light material suffering more snags if not new (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Light material — a fine, gauzy fabric. For the wordplay, take "more snags", drop the N (that's the "if not new" bit), and then suffering signals an anagram of what's left, giving you GOSSAMER.