Cryptic crossword clue
Smoother cover for pillow, all stuffing taken out, one wanders 11

The most common and most likely answer to this crossword clue is the 11 letter word SLEEPWALKER

I've seen this crossword clue in Financial Times
S
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Buddy explains!

The straight part
We know that "one wanders" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one wanders = sleepwalker.
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.

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