The most common and most likely answer to this crossword clue is the 15 letter word FRUCTIFICATIONS
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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 FRUCTIFICATIONS mean?
FRUCTIFICATIONS noun- The act of forming or producing fruit; the act of fructifying, or rendering productive of fruit; fecundation.
- The collective organs by which a plant produces its fruit, or seeds, or reproductive spores.