SHO [instaed of the usual Showtime clue]Minnesota twins?
AIRS [instead of tunes
OHIO [I was thinking the explorer's home: NINA or BOAT or some town]Rub the wrong away
ERASE [I first misread away
--- Don is sho'nuff sly] Great server
ACER [As stated here before --- and obviously unread, ignored, or forgotten --- no one uses the term that way; but Acer is a large maker of computers.]
Don is obviously too clever for me. I don't get the literal shoebox in "each four-square puzzle corner." Am I looking at the right words: ESSO, EONS, OTOE, ESSE? L.A. Crossword Confidential (an excellent deconstruction site) will no doubt explain when they post later on this morning.