Where to start with this one?!
Firstly I am strongly in agreement with Iratus (#54) that the 6th word of the second instruction is entirely inappropriate. If you look up the 4th and 5th words of that instruction in Wikipedia, it quickly tells you what that specific word means in this context, and that is not how it is being used in this puzzle - quite the opposite. I suspect I may be one of many to have have wasted a fair amount of time being misled by that.
Secondly thanks to Wolfgang (#27 & particularly #40) for getting me over the line on the extra clue.
Smithsax - If you want to narrow down your possibilities, you need to think outside the box, if you get my drift. That should point you to fulfilling the 3rd instruction. The extra clue contains wordplay (3 words) for 2 letters of the answer and a definition (2 words) for the 4 letter answer.