The most common and most likely answer to this crossword clue is the 6 plus 6 letter word TOILET TISSUE
I've seen this crossword clue in The Guardian
T
O
I
L
E
T
T
I
S
S
U
E
Buddy explains!
The straight part
We know that "Sheets found in bathroom" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sheets found in bathroom = toilet tissue.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.