Elder possibly demands support, accommodating religious leader (4)
I believe the answer is:
tree
'elder possibly' is the definition.
(elder is a kind of tree)
'support accommodating religious leader' is the wordplay.
'support' becomes 'tee' (tee is a kind of support).
'accommodating' indicates putting letters inside.
'leader' says to take the initial letters.
The initial letter of 'religious' is 'r'.
'tee' going around 'r' is 'TREE'.
'demands' is the link.
(Other definitions for tree that I've seen before include "famous actor" , "Eg, a baobab" , "Eg, elm or oak" , "May" , "Theme" .)