One litchi cultivated from the Stone Age (9)
I believe the answer is:
neolithic
'from the stone age' is the definition.
(I've seen this before)
'one litchi cultivated' is the wordplay.
'cultivated' is an anagram indicator.
'one'+'litchi'='onelitchi'
'onelitchi' with letters rearranged gives 'NEOLITHIC'.
(Other definitions for neolithic that I've seen before include "Relating to the later Stone Age" , "Belonging to late Stone Age" , "Description of ancient people" , "from Skara Brae?" , "Stone-Age" .)