The most common and most likely answer to this crossword clue is the 8 letter word PENELOPE
I've seen this crossword clue in The Daily Telegraph
P
E
N
E
L
O
P
E
More clues leading to the result PENELOPE
- Girl’s run off after writer
- Woman and writer go off to marry
- Girl of five escaping from cover after papa appears
- G – the bird with whom to run off
- Girl in prison wanting to escape for romance
- Author beat it with love for faithful wife
- Faithful wife given pound tip to embrace pole dancing
- Female writer to head for Gretna Green?
- Run away after writer gets girl
- Dash off and run off after fabulous lady
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 = penelope.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.