The phrase "had notion" can be replaced with several alternative expressions, such as "had an inkling", "had a suspicion", "had a feeling", or "had a hunch". Each of these terms suggests a sense of intuition or awareness of something without having concrete evidence to support it. Additionally, depending on the context in which "had notion" is used, other synonyms like "had an idea", "had a plan", or "had a concept" could be appropriate alternatives. Whichever synonym is chosen, it should accurately capture the intended meaning and tone of the original phrase.