Caramalt, amarillo, wheat malt, clean ale yeast, cold conditioning for a week, do all those 4 and you will get very close to it.
Something like a cooper's lager, about 25g of amarillo hops boiled in some malt and water for 5 mins, adding some steeped caramalt/light crystal (about 250g or so) and 0.5kg wheat malt+0.5kg dextrose fermented with US56 or a Kolsch/Alt yeast fairly cool should do it. You *could* use a lager yeast but that involves more work, just start with a clean ale yeast (Wyeast 1007/2565/1056, White Labs 029/001/060/011, Fermentis US56/S33) would be fine and not need as much care.
Of course us AG'ers get the better recipes but i think you could do it with extract as long as you make sure the extract is fresh and you ferment and sanitise properly.
If you can get it why not try the Brewer's Selection Amarillo Ale fresh wort kit, that should be pretty close.