Apache leader brought up nothing unimportant, say (8)
I believe the answer is:
geronimo
'apache leader' is the definition.
(I've seen this in another clue)
'up nothing unimportant say' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'nothing' becomes 'O' (looks like zero - 0).
'unimportant' becomes 'minor' (I've seen this in another clue).
'say' becomes 'eg' (both can mean for example).
'o'+'minor'+'eg'='ominoreg'
'ominoreg' reversed gives 'GERONIMO'.
'brought' is the link.
(Other definitions for geronimo that I've seen before include "Shout up high" , "Brave leader" , "exhilarated cry" , "Whee!; Apache chief" , "Cry of exhilaration" .)