Constant support mostly comprising brave individual, Native American (8)
I believe the answer is:
cherokee
'native american' is the definition.
(I've seen this before)
'constant support mostly comprising brave individual' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'support mostly' becomes 'kee' (I can't explain this - if you can you should give a lot more credence to this answer).
'comprising' means one lot of letters goes inside another.
'brave individual' becomes 'hero' (heroes are brave).
'c'+'kee'='ckee'
'ckee' placed around 'hero' is 'CHEROKEE'.
Can you help me to learn more?
(Other definitions for cherokee that I've seen before include "Perhaps brave" , "Native American people, originally living in the Appalachian Mountains" , "American tribesman" , "Southern US Indian" , "One of the Iroquois people" .)