The most common and most likely answer to this crossword clue is the 12 letter word BLACKCURRANT
I've seen this crossword clue in The Guardian
B
L
A
C
K
C
U
R
R
A
N
T
More clues leading to the result BLACKCURRANT
Buddy explains!

The straight part
We know that "fruit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fruit = blackcurrant.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 BLACKCURRANT mean?
BLACKCURRANT noun- A shrub, Ribes nigrum, that produces small, very dark purple, edible berries.
- The berry borne by this shrub.