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Correction, Saddleworthian, that should be Phoh is an alternative of Pho or Foh (my Chambers 2008).
I'll be on licensed premises for a while now - in anticipation of any other questions, the clues with extra words and whose answers require a symbol are both halves of each of the first 1 clue and the second 6 clue. The symbols required are entirely thematic.

Definitely PHOH. (PHO)TOS + H

Everything I've got makes sense, but I'm unable to find the sixth element -- presumably the one this is "arguably more apposite than the original".

Yes. If you have the other five correct, then the sixth element is symmetrically placed in the otherwise empty quadrant of the grid. Two lines crossing, and the word is a Biblical synonym of one of the larger elements in the song.

Still can't see that 6th one :-(

I could always be wrong, but I thought:
An eight-letter word in the shape of a diagonal cross, one line being on the main diagonal

Ah, of course! Thanks keepatit.

I have the instruction and the phrase but am struggling with the extra-word clues and one other: can anyone give me a hint for the first 3 ('Envelopes...') please?

Heisenberg - hidden reversal.

Blimey. Thanks.