1) Deice again 2) Dissolve again 3) Do a foundry job 4) Heat into a liquid again 5) Liquefy again 6) Liquify again 7) Make liquid again 8) Soften cheese again 9) Thaw further 10) Thaw once again 11) Thaw twice 12) Thaw, freeze, thaw Found on https://www.crosswordclues.com/clue/remelt