IOWA CITY, Iowa - The nationally-ranked University of Iowa wrestling program will stage a free instructional clinic for children elementary school aged and younger at 4:30 p.m., Sunday, Dec. 1, at Carver-Hawkeye Arena.    The first 500 participants will receive free instruction from members of the coaching staff for the nationally ranked Hawkeyes, a free Iowa Wrestling t-shirt, a free 2002-03 Iowa Wrestling schedule poster and free admission to the Iowa wrestling team's dual meet against Arizona State at 7 p.m., Sunday.    Clinic participants should enter Carver-Hawkeye Arena at the north entrance. Doors will open at 4 p.m. The clinic is expected to begin at a 4:30 p.m. The clinic will be staged on the varsity mat on the floor of the Arena, and will last approximately 60 minutes.    Adults accompanying clinic participants will be required to purchase a ticket to the Iowa-Arizona State dual meet. General public tickets costs $8 each.