The most common and most likely answer to this crossword clue is the 4 letter word NINA
I've seen this crossword clue in The Daily Telegraph
N
I
N
A
More clues leading to the result NINA
- Maybe miss out with odd bits of insignia
- Woman in 'Fun in Acapulco'
- Girl’s name partly hidden, in actuality
- Name abbreviated in a cruciverbal Easter egg
- Lady, not totally square, wanting bit of adventure
- Out of condition, 10 25 sets this woman an example …
- Metals used in coins and lamps for Columbian ship
- Girl from London in Andover
- Girl’s name in America
- She‘s from Argentina – dancing’s not great according to 15/21
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 = nina.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.