A pod (6)
I believe the answer is:
legume
'a pod' is the definition.
(I know that legume is a type of pod)
This is all the clue.
(Other definitions for legume that I've seen before include "A vegetable for e.g. mule" , "Glue me (anag) - climbing bean or pea plant" , "Bean or pea, for example" , "pulse" , "Bean, pea etc" .)