Leek's cousin (5)
I believe the answer is:
onion
'leek's cousin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for onion that I've seen before include "Tear-jerking bulb" , "Bulbous vegetable" , "it can bring tears" , "Pungent vegetable" , "Tear-inducing edible bulb" .)