1) Bar recyclable 2) Bit of frat party litter 3) Bud holder 4) Frat party castoff 5) Frat party leftover 6) Frat party recyclable 7) Frat-party sight 8) Fraternity party detritus 9) Highway litter 10) Item popular with litterbugs 11) One with a tab in a bar 12) Part of many a six-pack 13) Recycling candidate Found on https://www.crosswordclues.com/clue/beer-can