Branch of the deer family (6)
I believe the answer is:
antler
'branch' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for antler that I've seen before include "Animal's extension" , "Branch" , "Bony outgrowth in the deer family" , "Stag's horn" , "Branched animal horn" .)