Lip balm ingredient (4)
I believe the answer is:
aloe
'lip balm ingredient' 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 (4) 5532" , "Flower, maybe vera" , "shrub" , "Fleshy-leaved plant" , "Plant source of purgative drug" .)