clarify, clear up, elucidate - make clear and (more) comprehensible; "clarify the mystery surrounding her death"

detail - provide details for

exposit, set forth, expound - state; "set forth one's reasons"

illustrate, instance, exemplify - clarify by giving an example of

particularise, particularize, specialise, specialize, specify - be specific about; "Could you please specify your criticism of my paper?"