Treason involved US politican (7)
I believe the answer is:
senator
'us politican' is the definition.
I can't tell whether this definition defines the answer.
'treason involved' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'treason' with letters rearranged gives 'SENATOR'.
Can you help me to learn more?
(Other definitions for senator that I've seen before include "Treason committed by member of Upper House" , "Statesman -- treason (anag)" , "Clinton, perhaps" , "Member of the Second House" , "Upper House member involved in treason" .)