Foolish strike gets anonymous backing in plant (9)

I believe the answer is:

amaryllis

(Other definitions for amaryllis that I've seen before include "Sly alarm I turn on for the flower" , "Lily-like plant" , "Large-flowered bulb" , "Bulbous plant with trumpet-shaped flowers" , "Showy bulbous plant" .)

I've seen this clue in The Times.

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