Potted ornamental (4)
I believe the answer is:
aloe
'potted ornamental' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aloe that I've seen before include "Succulent plant (may be bitter!)" , "Flower, maybe vera" , "Bitter drug from a leaf juice" , "Bitter fruit" , "has a bitter taste" .)