Crossword Genius

A leaf’s outline reproduced by a plant (7)

Ross

I believe the answer is:

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'plant' is the definition.
(alfalfa is a kind of plant)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for alfalfa that I've seen before include "Lucerne, a fodder plant", "odder plant", "Plant used as fodder", "A forage plant", "food plant".)