"Consort", "Spouse", and "Partner" are all words that refer to a person's husband, wife, or life companion. A consort is typically the spouse of a reigning monarch or a close companion. A spouse is the general term for a husband or wife. A partner refers to someone sharing a close personal or married relationship with another.
"Clear" means transparent, free from obstruction, or easily understood. It has no connection to marriage or companionship, and does not share the meaning group of the other three words.
Since Consort, Spouse, and Partner form a group of synonyms related to a life companion, while Clear stands apart with an unrelated meaning, the word that does not belong is option 4, Clear.