A scandal in the world of crosswords? Yes really: a clear case of plagiarism. The affair is described in a little more detail than here (though in a rather garish display) by Dean Mayer, aka Anax.
In summary, one of the cryptic setters for The Hindu, a venerable and highly respected Indian newspaper, has been caught “borrowing”. Incidentally, the offence was detected not because the lifted clues were recognised but because of the awfulness of the other clues. The incompetently composed clues contrasted so radically with some of the others that the decent ones could only have come from different sources.
This sort of thing is rare, I assume and hope, but many cryptic clues nevertheless have a certain familiarity about them, so some people might well detect a slight whiff of plagiarism. This goes for my own clues and for others', so much so that I have at times wondered whether I have been guilty of inadvertant plagiarism myself.
I generally comfort myself in those occasions with the “great minds” theory.