If you will have a car, then getting to the suburban restaurants mentioned in this thread will not be an issue. To them, I would add Don Juan in Park Ridge, which is a very good Mexican restaurant.
If you will not have a car, taking the blue line EL into Chicago will be easier then the suburban alternatives. You can get off at the Division St. stop, which will put you in the Bucktown or Wicker Park neighborhoods and there are many good, fun choices. Just run a search on this board with those names.
How far are you willing to travel? What kind of food or experience are you looking for? ("Clean but fun" isn't very specific.)
One nearby restaurant that is a steakhouse but much more (and much better) is the Black Ram in Des Plaines. This is a local gem. Everything I've had there has always been superb - the steaks, the seafood, EVERYTHING. Even the desserts are much better than you typically find. Nice folks, too. http://www.blackramsteakhouse.com
Rosemont has a bunch of excellent steakhouses, many of them located in hotels. I agree that Gibson's is an excellent choice, if you're looking for a steakhouse. It's in a hotel right next to the Rosemont Theater, if you're headed that way. http://www.gibsonssteakhouse.com Other highly-regarded steakhouses in Rosemont include Morton's http://www.mortons.com Also, Nick's Fishmarket which is as much of a steakhouse as a seafood restaurant. www.nicksfishmarketchicago.com
If pizza appeals to you, the stuffed pizza at Giordano's is terrific, something you can't get back home. Many Chicagoans will argue over pizza - stuffed vs pan pizza, this place vs that place - but as a long-time resident who has tried them all, I still think Giordano's stuffed pizza is the best. Their Rosemont location is right on Higgins Road. http://www.giordanos.com
One other tip - the Chicago Tribune has a website for local entertainment called "Metromix", which has all their restaurant reviews as well as complete listings that are searchable. The web address is http://metromix.chicagotribune.com/di...
Rosemont isn't Chicago.
the only thing nearby worth eating is Paradise pup on River Road.
Otherwise, head out to Arlington Heights, Elk Grove Village, Bensenville, Des Plaines for truly authentic Japanese izakaya joints and Korean bbq shacks.
117 Elmhurst Rd
Des Plaines, IL 60016
1144 S Elmhurst Rd
Mt Prospect, IL
New Seoul Restaurant
638 W Algonquin Rd
Des Plaines, IL
1201 E Higgins Rd
Elk Grove Village, IL
they're not unique if you've been to Korean restaurants, but they're certainly much more fun/interesting to me than Gibson's, which is, obviously, a chain.