1) Affair 2) Attention 3) Best-selling Nirvana album 4) Business 5) Emily Litella catchphrase 6) Heed 7) Number-one single in Austria 8) Phrase of unimportance Found on https://www.crosswordclues.com/clue/nevermind
attention; heed; notice (usually used in negative constructions): Pay him no nevermind. · business; affair; responsibility (usually used in negative constructions): It's no nevermind of yours. Found on https://www.infoplease.com/dictionary/nevermind