I must leave non-Jewish kind (6)
I believe the answer is:
gentle
'kind' is the definition.
(I've seen this before)
'i must leave non-jewish' is the wordplay.
'must leave' indicates named letters should be taken away.
'non-jewish' becomes 'gentile' (I've seen this in another clue).
'gentile' with 'i' taken away is 'GENTLE'.
(Other definitions for gentle that I've seen before include "Soft and mild, quiet and soothing" , "Merciful -- grub" , "Mild and considerate" , "Moderate in effect" , "Mild, moderate" .)