I wouldn't worry about the confusion, don't define it, but describe it. The description will morph over time as its character changes. Army SF did more harm than good when it narrowly "defined" UW along organizational lines (underground, auxiliary, guerrilla force), which is basically nothing more than another weapon system to coerce. Political warfare is complex and many facets, that is just the way it is. If you do define it you'll have to limit your discussion to the narrow definition you applied to it. I know that is the army way, but then again the army is still trying to figure out how to use military force to achieve political objectives (different than political warfare) in the 21st Century.