Glade grazer (4)
I believe the answer is:
deer
'glade grazer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for deer that I've seen before include "Ruminant(s) -- breed of 13 down" , "Antler-bearing animal" , "Grazing animal(s)" , "Antlered animal" , "Source of venison" .)