This question asks for the word that breaks the pattern shared by the rest. Looking at the meanings, "consort", "spouse", and "partner" all point to the same idea, a person joined to another in marriage or a close committed relationship. A consort is often used for the marital partner of royalty, a spouse is the everyday term for husband or wife, and a partner describes someone in a shared personal or married bond.
"Clear" carries a completely different meaning, relating to transparency, absence of obstruction, or something being easy to understand. It has nothing to do with marriage or companionship, which is exactly why it stands out from the group.
Given that three of the four words are synonyms for a life companion and one is unrelated in meaning, the odd one out and the correct answer is option 4, Clear.