29a normal clue
You need to list your clue answers in alphabetical order, with the extra word from that clue next to it. The 1st letters of the extras then spell out your 4downs. Even with a few blanks in the list you might be able to pick out one or the other of the 2 main phrases, then work backwards with the 1st letters of your extra words to get more clues filled in. The first clue in the alphabetical list is the answer to 36a and the last in the alphabetical list is 15a.
Hope I haven't confused you more! Ask again if you're still stuck