The phrase "hath a gander" is an old-fashioned expression that means to take a quick look at something or someone. If you want to use a synonym to convey the same meaning, you can try words like glance, peek, sneak a peek, or take a quick look. You could also use the phrase "take a glimpse" to describe the action of looking briefly. Other possible synonyms include spy, observe, scrutinize, survey, and inspect. However, it is important to choose the right synonym based on the context of your sentence to ensure that your message is clear and accurate.