Across: 1.pie, 4.eon, 6.shell, 7.zap, 9.fry, 11.spy, 13.arch, 14.ante, 15.elm, 17.sly, 19.eye, 21.eagle, 22.men, 23.lie

Down: 1.pez, 2.ESP, 3.help, 4.elf, 5.nay, 8.april, 10.ritzy, 11.she, 12.yam, 16.luge, 17.sum, 18.yen, 19.eel, 20.eve