No, it was not my best effort.
Clueless fuck refers to the position, although it is a description of the person I suppose -- but only in the context of the raging bullshit he or she posts, not as a general definition.
For example if you said Barry Lookinland was a good actor, I'd say you were a clueless fuck, but the clueless fuckacity only applies to that particular position.
Calling someone a "fuck" is a synecdoche (horrible word to say outloud by the way). You're shortening the insult "you are a fucking retard."
Or perhaps it's a hendiadys, which is where you separate a typical pairing of two words by connecting them with the word "and."
For example, Kaos thinks Chop is the fucking retard of Tigersx. Instead, he could say Chop is the fuck and the retard of Tigersx.
I looked up "fuck" and found that one of its definitions could mean "a contemptible person." So it is legal to use it as a noun.
Now, back to mindless arguing.