... vera, a soothing plant (4)

I believe the answer is:

aloe

(Other definitions for aloe that I've seen before include "Bitter drug from a leaf juice" , "Plant source of purgative drug" , "Succulent plant (4) 5532" , "Flower, maybe vera" , "Fleshy-leaved plant" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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