Serves up a single hint - it's made from sesame seeds (6)
I believe the answer is:
tahini
'made from sesame seeds' is the definition.
I know nothing about this answer so I can't tell whether this works.
'serves up a single hint' is the wordplay.
'serves up' indicates an anagram (I've seen 'served up' mean this).
'single' becomes 'I' (I as in one).
'a'+'i'+'hint'='aihint'
'aihint' is an anagram of 'TAHINI'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for tahini that I've seen before include "Sesame paste; in a hit (anag.)" , "Sesame seed paste" , "Sesame-seed based foodstuff" , "Paste of sesame seeds" .)