Forest foragers (4)
I believe the answer is:
'forest foragers' 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 "Antlered animal" , "Sledge animals for Father Christmas" , "Hoofed animals" , "Eg, stag or doe" , "Hoofed grazing animal" .)