Spiky plant with white bell-shaped flowers, native to hot dry parts of North America (5)

I believe the answer is:

yucca

(Other definitions for yucca that I've seen before include "House plant with spiky flowers" , "Plant of the Agavaceae family" , "Mexican plant" , "Adam's Needle plant" , "Ornamental plant" .)

I've seen this clue in The Guardian.

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