This flower turns out to be a hay danger (9)

I believe the answer is:

hydrangea

(Other definitions for hydrangea that I've seen before include "Plant's" , "Flower you might find in garden hay, oddly" , "Common garden plant" , "Ornamental flowering shrub - handy gear (anag)" , "Shrub - garden hay (anag)" .)

I've seen this clue in The Irish Times.

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