Cryptic crossword clue
Wallpaper line spoilt curtains 9

The most common and most likely answer to this crossword clue is the 9 letter word LINCRUSTA

I've seen this crossword clue in The Guardian
L
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A

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The straight part
We know that "Wallpaper/Wallpaper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wallpaper/wallpaper = lincrusta.
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.

Crossword Answer definitions

LINCRUSTA noun
  1. A wallcovering made from a paste of gelled linseed oil and woodflour spread on heavy canvas and embossed with a pattern.

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