Tahini ingredient (6)
I believe the answer is:
sesame
'tahini ingredient' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sesame that I've seen before include "Source of seed and oil" , "Plant with edible seeds" , "Open ...... is magic phrase for opening door in pantomime" , "said to be effective in opening spell" , "which magically opens" .)