The spelling of the word "Clausi" can be explained through the use of the International Phonetic Alphabet (IPA). The first syllable "Cla" is pronounced as /klɑː/, where the "a" represents the sound of the letter "a" in the word "car". The second syllable "usi" is pronounced as /juːsi/, where the "u" represents the sound of the letter "oo" in the word "pool". Therefore, "Clausi" is spelled as C-L-A-U-S-I with a strong emphasis on the first syllable "Cla".