Ring bearer? (4)
I believe the answer is:
tree
'ring bearer?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tree that I've seen before include "Holly, perhaps" , "Theme" , "''I think that I shall never see / A poem lovely as a ...'' (Kilmer)" , "Birch, say" , "Eg, a baobab" .)