The most common and most likely answer to this crossword clue is the 10 letter word TARPAULINS
I've seen this crossword clue in The Daily Telegraph
T
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Buddy explains!
The straight part
We know that "sheets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sheets = tarpaulins.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 TARPAULINS mean?
TARPAULINS noun- A tarp, a heavy, waterproof sheet of material, often cloth, used as a cover or blanket.
- A sailor (often abbreviated to tar)
- Any heavy, waterproof material used as a cover.
- Canvas waterproofed with tar, used as a cover.
- A hat made of, or covered with, painted or tarred cloth, worn by sailors and others.