1) Back for front 2) Back of front 3) Back to front 4) Bombard ending 5) Bombard tag-on 6) Cash add-on 7) Cash addition 8) Cash attachment 9) Cash back 10) Cash chaser 11) Cash closer 12) Cash closing 13) Cash conclusion 14) Cash ender 15) Cash ending 16) Cash extender 17) Cash extension 18) Cash finish Found on https://www.crosswordclues.com/clue/ier