Ekspliko is a word that I barely encountered in 20 years of speaking Esperanto. Now I'm seeing it everywhere among new speakers. I wonder if it got listed in Google Translate, Tatoeba, or some other online dictionary. It's a rare word - roughly equivalent to "to explicate".
The normal word for "explanation" is klarigo.
Of course, if you were trying to say "I'm trying to find an explication", please pardon the interruption.