Clue: Word from above: disheartened Jewish scholar leaves (8)
Answer: KOHLRABI
Explanation: Definition: leaves
A charade of KOHL ('word from above' – directly above, 16A) plus RA[b]BI ('Jewish scholar') minus the middle letter ('disheartened'). Kohlrabi does have leaves (and you can eat them), but it is grown for its swollen stem.