Cryptic crossword clue
A new clothing element — metallic, not your standard yarn 4-5

The most common and most likely answer to this crossword clue is the 10 letter word ANTI-NOVEL

I've seen this crossword clue in The Times
A
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The straight part
We know that "not your standard yarn" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not your standard yarn = anti-novel.
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 ANTI-NOVEL mean?

ANTI-NOVEL noun
  1. A novel that deliberately avoids the typical conventions of the novel, such as a coherent plot and protagonist.
  2. (by extension) Any style of writing that deviates from the norm of technical conventions used in writing literature.

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