Synonyms for Clear Up (same or very similar meaning)
WordNet sense 1 (become clear):
brighten, clear, light upWordNet sense 2 (make clear and (more) comprehensible):
clarify, elucidateWordNet sense 3 (make free from confusion or ambiguity; make clear):
crystallize, enlighten, illuminate, crystalise, crystalize, crystallise, straighten out, shed light on, sort outWordNet sense 4 (finish a task completely):
get through, finish up, finish off, mop up, polish off, wrap upFrom the ODE community, based on WordNetadd/edit