A person who explains things clearly and makes them easier to understand.
From 'elucidate' plus the Latin suffix '-or' (meaning 'one who does'). This agentive suffix creates a noun for a person performing the action of the verb.
The '-or' suffix is Latin's gift to English for naming professions and roles: a person who educates is an educator, one who creates is a creator, one who elucidates is an elucidator — it's a pattern 2,000 years old.
Complete word intelligence in one call. Free tier — 50 lookups/day.