The most common and most likely answer to this crossword clue is the 6 letter word CARPEL
I've seen this crossword clue in Financial Times
C
A
R
P
E
L
More clues leading to the result CARPEL
Buddy explains!
The straight part
We know that "reproductive organ" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reproductive organ = carpel.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 CARPEL mean?
CARPEL noun- One of the individual female reproductive organs in a flower. A carpel is composed of an ovary, a style, and a stigma, although some flowers have carpels without a distinct style. In origin, carpels are leaves (megasporophylls) that have evolved to enclose the ovules. The term pistil is sometimes used to refer to a single carpel or to several carpels fused together.