The most common and most likely answer to this crossword clue is the 5 letter word LIMES
I've seen this crossword clue in The Guardian
L
I
M
E
S
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 = limes.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 LIMES mean?
LIMES noun- A boundary or border, especially of the Roman Empire.
- Any inorganic material containing calcium, usually calcium oxide (quicklime) or calcium hydroxide (slaked lime).
- Any gluey or adhesive substance; something which traps or captures someone; sometimes a synonym for birdlime.
- A deciduous tree of the genus Tilia, especially Tilia × europaea; the linden tree, or its wood.
- Any of several green citrus fruit, somewhat smaller and sharper-tasting than a lemon.
- Any of the trees that bear limes, especially Key lime, Citrus aurantiifolia.
- A brilliant, sometimes yellowish, green colour associated with the fruits of a lime tree.
- A fan fiction story which contains sexual references, but stops short of full, explicit descriptions of sexual activity (coined by analogy with lemon).
- A leash.