Cryptic crossword clue
Unusually rare pigpen that has changing decor 10

The most common and most likely answer to this crossword clue is the 10 letter word REPAPERING

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "changing decor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case changing decor = repapering.
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 REPAPERING mean?

REPAPERING verb
  1. To apply new wallpaper to, either by first stripping the old wallpaper off, or by papering over the top.
REPAPERING noun
  1. The act of replacing wallpaper.

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