Source of soothing gel (4)

I believe the answer is:

aloe

(Other definitions for aloe that I've seen before include "has a bitter taste" , "Succulent plant (may be bitter!)" , "Plant source of purgative drug" , "Succulent plant (4) 5532" , "Flower, maybe vera" .)

I've seen this clue in The Washington Post and the USA Today.

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