1) Assume crystalline form 2) Become crystallized 3) Clarify 4) Clear 5) Clear up 6) Crystalise 7) Crystallise 8) Crystallize 9) Elucidate 10) Enlighten 11) Illuminate 12) Make clear 13) Shed light on 14) Sort out 15) Straighten out Found on https://www.crosswordclues.com/clue/crystalize