Very hard - don't know how to enter Acrosses, or how to read the Downs! However, as well as a few Across answers, I've got one of the 3 specials, 39Ac. It hasn't given me much lead to the title.
There seems to be a slight ambiguity in the second sentence of the rubric. Does it mean the initial letters of each answer relate..., or that the answers themselves relate, before being amended?