The most common and most likely answer to this crossword clue is the 6 letter word CURTSY
I've seen this crossword clue in The Daily Telegraph
C
U
R
T
S
Y
More clues leading to the result CURTSY
- Short words many ultimately used for formal greeting
- Woman’s greeting abrupt, extremely surly
- Short, extremely seemly gesture
- Short and extremely sexy movement made by a woman
- Bob’s dog gets testy regularly
- Girl’s greeting abrupt and outwardly surly
- Bob is short, and scarcely lacking heart
- Bob is brusque, say, in heartless way
- Blunt spy ditches Penny for Bob
- What she might do in front of Queen could make us cry with embarrassment, finally
Buddy explains!

The straight part
We know that "What she might do in front of Queen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what she might do in front of queen = curtsy.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 CURTSY mean?
CURTSY noun- A small bow, generally performed by a woman or a girl, where she crosses one calf of her leg behind the other and briefly bends her knees and lowers her body in deference.
- To make a curtsey.