Well, it is nothing new, many have done that (including me) and still do (including me 2.0) :
The fast expanding answer
Let me explain. A new puzzle is posted, within the diffulty, different people might type the answer as the same time. This technique, like you can see in the comments of It's in your best interest to just leave me be, consists in putting only the answer, and then editing the posts multiple times to put all the clues that go with the answer.
The thing is that this technique brings one or two problems. For instance, you might have the answer but lack some clues, but as you "locked" the answer before the others you've got time to think of those clues while editing. And there is also the "fair-play-crushing" in doing that, especially if someone started writing all clues etc.
So we could resume by asking :
Is it fair to put an answer with no details to be first and then edit the clues?
Or should we make a special answering rule for puzzling SE ?