Pea-plant and tree in shelter (6)
I believe the answer is:
legume
'pea-plant' is the definition.
'tree in shelter' is the wordplay.
'tree' becomes 'gum' (gum is a kind of tree).
'in' indicates putting letters inside.
'shelter' becomes 'lee' (I've seen this before).
'gum' placed within 'lee' is 'LEGUME'.
'and' acts as a link.
(Other definitions for legume that I've seen before include "Bean, pea etc" , "Pea-family crop plant" , "Veg as pea, bean" , "A vegetable for e.g. mule" , "Glue me (anag) - climbing bean or pea plant" .)