The most common and most likely answer to this crossword clue is the 6 letter word ASTRID
I've seen this crossword clue in The Guardian
A
S
T
R
I
D
More clues leading to the result ASTRID
- Scandinavian girl, maybe, to help securing half of street
- A case of straight shot the Danish miss?
- Woman sitting on bike or horse, mostly
- Foreign girl having legs round but short
- Girl nearly mounted
- Girl riding without support
- A short step for a woman
- Dry wraps discontented sweet lady
- Scandal reflected on a society girl
- Girl suggesting divine beauty, mostly in the saddle?
Buddy explains!

The straight part
We know that "girl" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case girl = astrid.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.