Mediterranean plant with white or pink flowers whose aromatic seeds are used as a condiment and a flavouring (5)
I believe the answer is:
cumin
(Other definitions for cumin that I've seen before include "Culinary spice" , "Spice seeds" , "Aromatic seeds used for flavouring" , "Aromatic seeds used as condiment" , "Spice used in chilli and curry powder" .)