Plant with lance-shaped leaves (4)
I believe the answer is:
aloe
'plant with lance-shaped leaves' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aloe that I've seen before include "Flower, maybe vera" , "has a bitter taste" , ". . . . vera, soothing plant" , "O, ale with bitter plant" , "Genus of bitter herbs" .)