The most common and most likely answer to this crossword clue is the 6 plus 3 letter word SINGLE BED
I've seen this crossword clue in The Guardian
S
I
N
G
L
E
B
E
D
More clues leading to the result SINGLE BED
Buddy explains!
The straight part
We know that "No sleeping partners here?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case no sleeping partners here? = single bed.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.