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 Sunday 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 "Bob" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bob = 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.