The most common and most likely answer to this crossword clue is the 4 letter word VEGA
I've seen this crossword clue in Financial Times
V
E
G
A
More clues leading to the result VEGA
- Star, say, visiting Virginia
- Very mature rising star
- Star seen in massive gallery
- Chill in the company of a star
- Star mostly not eating dairy, meat, fish or eggs
- Star in sleazebag eventually shown up
- Star such as appears in Virginia
- Star not quite convert to compassionate eating?
- Greens getting a conspicuous star
- US city expels young female star
Buddy explains!

The straight part
We know that "Star" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case star = vega.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 VEGA mean?
VEGA noun- (Latin America) An open tract of ground; a plain, especially one which is moist and fertile, such as those used for growing tobacco.
- A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.