Family gore (5)
I believe the answer is:
blood
This clue is a double definition.
'family' is the first definition.
(thesaurus)
'gore' is the second definition.
('blood' can be a synonym of 'gore')
(Other definitions for blood that I've seen before include "Oxygen carrier" , "Male siblings -- sworn friends" , "It contains plasma and platelets" , "Gore" , "Sanguineous fluid" .)