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The second answers are those which aren't used originally. The "first pass" basically tells you to rub it all out and start again using the other (second, unused) answers.
1a is HARING/FEDORA and 1d is PRESET/FICHUS.
WIRELESS is a second answer entered at 35.
I started by noting that the 4th and 5th of the 8-letters cross with the 2nd and 6th of the 7-letters ... that pretty much fixed POOHPOOH and OPENERS.
Hope it helps, this is a good one well worth following through.