One with Native American heritage is furious (12)
I believe the answer is:
incandescent
'furious' is the definition.
(incandescent can mean extremely angry)
'one with native american heritage' is the wordplay.
'one with' means one lot of letters go next to another.
'native american' becomes 'incan' (someone from the historical Incan Empire).
'heritage' becomes 'descent' (I've seen this in another clue).
'incan' next to 'descent' is 'INCANDESCENT'.
'is' acts as a link.
(Other definitions for incandescent that I've seen before include "Glowing hot" , "livid" , "Hotly glowing bright" , "frenzied ..." , "Glowing with heat" .)