The most common and most likely answer to this crossword clue is the 9 letter word OURSELVES
I've seen this crossword clue in Independent
O
U
R
S
E
L
V
E
S
More clues leading to the result OURSELVES
- Old, old city’s little people — us, emphatically
- EU solvers switching to US
- Love rues dancing on top of stool for us
- Solver Sue’s beaten us emphatically
- Resolve US, resolve US
- What belongs to us little people; prime concern of Brexiteers?
- Santa’s little helpers belong to us first — us personally!
- Kinky lovers use the Guardian — emphatically so
- On reflection, the Guardian sure loves to appear inept
- Guardian people personally bear being translated with spirits
Buddy explains!

The straight part
We know that "US" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case us = ourselves.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 OURSELVES mean?
OURSELVES pronoun- (reflexive pronoun) Us; the group including the speaker as the object of a verb or preposition when that group also is the subject.
- We; intensifies the subject as the group including the speaker, especially to indicate that no one else satisfies the predicate.