The most common and most likely answer to this crossword clue is the 6 letter word PORTIA
I've seen this crossword clue in Independent
P
O
R
T
I
A
More clues leading to the result PORTIA
- Literary heiress left capital around
- Beautiful heiress left a single article
- One left first, followed by a rich heiress
- Heroine left on the Titanic starts to imagine Atlantis
- Rich heiress in sports car, did you say?
- Theatrical lawyer left one arraigned at the outset
- Shakespearean character left Italy with a …
- Left one by a rich heiress
- Shakespearean heroine’s father fencing unlikely trio
- Shakespearean role left main characters at heart upset
Buddy explains!

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