The spelling of the word "Cletos" can be explained through the use of the International Phonetic Alphabet (IPA). The letters "C" and "S" both represent the "s" sound, while the letter "E" is pronounced as "eh" as in "bed". The letter "O" has a short "o" sound as in "hot", and the final "S" represents the "z" sound. Therefore, "Cletos" is pronounced as "KLEH-tohz" in IPA phonetic transcription.