I don't see where the homophone is, rambler, unless you mean eager/eager- but those are variant spellings of the same word. I guess I don't think it's quite fair to use a synonym for a word that's a synonym for the answer when the synonym in the clue isn't a synonym for the answer itself. (I know- very messy, but when you try to streamline it it's even more confusing, and that's basically the point.) It's indeed rather like the ghost anagram, which usually uses a synonym as fodder. When you know what the answer is you can see it, but when you don't you might find that finding it is impossible.