Escuan - column 4 should make sense, and it's part of the location - more than one word. A bit of googling round 1a should get you there. The five letters you mention are one of the jumbles - and again, a bit of googling round 1a should point you in the right direction.
To be honest, I'd ignore the words in brackets - they're not necessary to solve the puzzle and I only managed to work out their significance after I'd finished. And even then, it took me a while (though some of the hints in the above head are v helpful, especially Mersault's).