The most common and most likely answer to this crossword clue is the 7 letter word KUMQUAT
I've seen this crossword clue in The Guardian
K
U
M
Q
U
A
T
More clues leading to the result KUMQUAT
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 = kumquat.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 KUMQUAT mean?
KUMQUAT noun- A small, orange citrus-like fruit which is native to Asia (Citrus japonica, syn. Fortunella japonica).