After you search the concept you're thinking of, Reverse Dictionary gives you a list of words and phrases related to it. And, chances are, the results will give you the word you were thinking of — plus better alternatives.
In my demo above, for instance, I searched up "urge to travel," hoping to pinpoint the word "wanderlust." But I found that answer #15, "itchy feet," is the less cliché term I wanted to use. (source: Mashable)