Crossword Genius

A polo horse gets out of the way of this plant! (5)

Ross

I believe the answer is:

peony

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for peony that I've seen before include "Garden flower" , "Plant with large red, white or pink flowers" , "Herbaceous flower" , "Bloom" .)

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