The most common and most likely answer to this crossword clue is the 5 letter word PERRY
P
E
R
R
Y
Buddy explains!
The straight part
We know that "Fruit juice/tennis star" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fruit juice/tennis star = perry.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 PERRY mean?
PERRY noun- A fermented alcoholic beverage made from pears; somewhat analogous to cider.