In obsolete|lang=en terms the difference between clarify and discuss
is that
clarify is (obsolete) to glorify while
discuss is (obsolete) to communicate, tell, or disclose (information, a message, etc).
As verbs the difference between clarify and discuss
is that
clarify is to make clear or bright by freeing from feculent matter; to defecate; to fine; -- said of liquids, as wine or syrup while
discuss is (obsolete|transitive) to drive away, disperse, shake off; said especially of tumors.