The most common and most likely answer to this crossword clue is the 4 letter word GIRL
I've seen this crossword clue in The Guardian
G
I
R
L
More clues leading to the result GIRL
- Female US soldier joining both sides
- Female into equal rights during revolution
- Female left oil installation, heading north
- . Liberal doctor raised young lass
- Miss large outfit heading west
- She wastes every second in larking around
- Miss touring Gibraltar, having rejected Rabat
- Miss large equipment being erected
- She has a serviceman on both sides
- Young woman resident in Stirlingshire
Buddy explains!

The straight part
We know that "She" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case she = girl.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 GIRL mean?
GIRL noun- A female child, adolescent, or a young woman.
- A young female animal.
- (sometimes offensive) A woman, especially a young woman
- A female servant; a maid. (see usage notes)
- A queen (the playing card.)
- A term of endearment. (see usage notes)
- One's girlfriend.
- One's daughter.
- A roebuck two years old.
- Cocaine, especially in powder form.
- (somewhat childish) A female (tree, gene, etc).
- A boy or man who is weak or sentimental.
- To feminize or girlify; to gender as a girl or as for girls.
- (somewhat informal) To staff with or as a girl or girls.