Rock-garden plant (7)

I believe the answer is:

alyssum

(Other definitions for alyssum that I've seen before include "Rockery plant" , "Asylums (anag.)" , "Slum, say (anag) - garden plant" , "Garden plant, sweet white/yellow flowers" , "Rock garden or bedding plant" .)

I've seen this clue in The Sun.

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