The word "politicist" is spelled with a "-t" at the end rather than the more common "-s" because it is formed from the political suffix "-ist" and not the more common "-ic" suffix. The word is pronounced pəˈlɪtɪsɪst, with the stress on the second syllable. A politicist is a person who is involved in politics or has political beliefs, similar to a politician. However, the term is not as commonly used as other political terms such as "politician" or "political analyst."
The word "Politicist" is not a standard term found in the English language, and therefore it does not have a specific etymology. It appears to be a derivative of the word "politics" with the addition of the suffix "-ist", which is often used to form nouns denoting a specific type of person or practitioner. If "Politicist" is used in a particular context, it might imply someone who is highly knowledgeable or actively engaged in politics. However, without a specific context or usage, it does not have an established etymology.