I am stuck with a completed grid and extra letters.
Based on robt (@15) suggestion, dials D1, D2, D3, D4 have letters:
D11, D12, D13,..........D18
D21, D22, D23.......... D28
D31, D32, D33...........D38
D41, D42, D43...........D48
To see the 6-word phrase, one has to read these letters vertically D11...D41,D12....D42, D13...D43 and so on.
He also confirmed @29, D48 is 'C'. That has to be a noun,
@18 he said he saw a few words and could reverse engineer the phrase.
I do not see any word.
Incorrect parsing could give wrong letter and wrong dial number, so unless parsing is perfect, there is no chance of getting the phrase right.
I have answers to 1a, 13a, 25a, 29a, 1d, 4d, 6d, 23d, 24d and their letters, but I suspect my parsing to be incorrect.
That said, unlike some of the recent Genius puzzles that took us to a layer of GK outside, this puzzle is entirely dependent on solving cryptic clues. I thank Soup for that.
I am afraid, I am heading to a DNF. But, there is still time.