The most common and most likely answer to this crossword clue is the 9 letter word FRUITLESS
I've seen this crossword clue in The Guardian
F
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More clues leading to the result FRUITLESS
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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 FRUITLESS mean?
FRUITLESS adjective- Bearing no fruit; barren.
- Unproductive, useless.
- Of a person: unable to have children; barren, infertile.
- Of a diet, etc.: without fruit.