Daring USA duo involved with CIA (9)
I believe the answer is:
audacious
'daring' is the definition.
(I know that daring can be written as audacious)
'usa duo involved with cia' is the wordplay.
'involved with' indicates an anagram (involved can mean confusing or complex).
'usa'+'duo'='usaduo'
'usaduo' anagrammed with 'cia' gives 'AUDACIOUS'.
(Other definitions for audacious that I've seen before include "Brazen" , "Dare-devil" , "Recklessly daring" , "Bold - impertinent" , "Risky" .)