Sesame seed paste (6)
I believe the answer is:
tahini
'sesame seed paste' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tahini that I've seen before include "Sesame seed paste" , "Sesame paste; in a hit (anag.)" , "Sesame-seed based foodstuff" , "Paste of sesame seeds" .)