Large members of the deer family (4)
I believe the answer is:
elks
'large members of the deer family' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elks that I've seen before include "Large deer with flattened antlers" , "Large deer of Northern Europe" , "Moose(s)" , "Moose" , "Large deer of Europe and N America" .)