Scallion kin (4)
'scallion kin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for leek that I've seen before include "Plant (onion relative) eaten as a vegetable" , "Vegetable of the onion family" , "Plant; Welsh emblem" , "Vegetable related to onions" , "Onion's relative" .)
(Other definitions for chive that I've seen before include "Leaves" , "Herb of onion family" , "12 down-like herb" , "Onion-like herb" .)