Being, thing (6)
I believe the answer is:
entity
I believe this is a double definition.
'being' is the first definition.
(I've seen this in other clues)
'thing' is the second definition.
(I've seen this before)
(Other definitions for entity that I've seen before include "Essence, existence" , "Anything that exists" , "It exists as a seperate thing (6)" , "Something existing in its own right" , "A thing with distinct and independent existence" .)