I recently asked this question. I asked for a "sufficient condition", but of course, I had in mind a certain kind of answer, as it's trivial to find "some sufficient condition" for any statement. The problem is, I got an answer that didn't satisfy me, but I can see how other people would see it as a bona fide answer. I then edited the question to make clear what I was looking for.
What's the right approach in this case? Accept the answer and ask the question again, clarified? Or edit the question to make it clearer?