K Cobain's widow provides spice (5)
I believe the answer is:
clove
'spice' is the definition.
(clove is a kind of spice)
I can't explain the rest of the clue.
(Other definitions for clove that I've seen before include "Spicy bud - section of garlic" , "Flower bud used as a spice" , "Payment for hostage" , "A small bulb as of garlic" , "Dried flower bud spice" .)