"I fear thee (not quite so) ancient foreigner." Liked the poem (actually even read the whole thing years ago) and of course the mechanism. I was all ready to start looking for other names for albatross and things related to weddings when I got to clue
72A72AHydrogen Peroxide (abbr., not the chemical formula; but knowledge of chemical formulae will definitely help with solving the meta!)
[---] . Of course at clue
65D I started looking for letters in a V shaped pattern...I'm never one to let a perfectly good mechanism go uninvestigated. Thanks Ben