Be sure to check out the bonus puzzle after you finish this puzzle! You can find the link in comments section under "bonus puzzle"
Hint #1: 1-D, 31-D, 41-A
Hint #2: 57-A is clued that way because knowing it's pronounced KEY is key to the meta
Hint #3: Can you pair up QUAY with another grid entry to sound out the name of a shoe brand?
Hint #4: NIGH + QUAY = NIKE... there are 7 shoe brands and their halves are symmetrically placed
Hint #5: Once you find all 7 shoes, you will need to extract the first letters from the entries AND the clues
Hint #6: Extract the first letter of entries in grid order by name of shoe (Puma, Reebok,...) + first letter of clues for first half of shoe (POO, RHEE,...) + first letter of clues for second half of shoe (MAA, BACH,...)