The most common and most likely answer to this crossword clue is the 7 letter word STARLET
I've seen this crossword clue in The Sunday Telegraph
S
T
A
R
L
E
T
More clues leading to the result STARLET
- Good young performer beginning to entertain the French
- Telephone informers about a potential lead
- Being miscast rattles Hollywood wannabe?
- Call informers about potential lead
- Aspiring actress delivering line with energy in debut
- Note liberal expression of annoyance upset young celebrity
- Aspiring actress latest to get drunk? About right
- Young actress from Red Dwarf and Rent?
- Jump to welcome the French actress who’s young and promising
- Young actress beginning to captivate the French
Buddy explains!

The straight part
We know that "Aspiring actress" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aspiring actress = starlet.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 STARLET mean?
STARLET noun- A young actress with a promising career ahead of her.
- An accomplished and important supporting player in a sports team.
- A small star.
- Illuminated by starlight.