(Sigh) And I was doing so well with this.
I cannot find the second G (the first is in 4D), but that's not important. I think I have had 7D wrong from the start, as I assumed it was the end of Quebecers, and now find I have it as a lullaby not an election. But I can't do anything with 8D (an anagram of AMAINTRO?), as it doesn't seem to fit any Park, National or otherwise, that I can find. And I assume 14A is a proper noun.
If my 7D is wrong, that might explain why I can't get 10A, but none of the clues seem to be of any particular sort. RUBBISHY is far too long to fit.