One person was injured, possibly seriously, in a traffic wreck, in northeastern Clarion County.     The man hurt in this incident had to be flown, from near the wreck scene, to Pittsburgh's U-P-M-C Presbyterian Hospital trauma center for treatment.     It was about 6:30 Tuesday evening that Richard Brake of the Kittanning area had been driving an s-u-v at high speed on Miola Road, just north of Maxwell Road, in Highland Township.     As his vehicle crested a hill on a curve, Brake lost control of the s-u-v.     The vehicle went off of the road, hit a dirt enbankment and finally flipped over.     Brake was trapped in his s-u-v and had to be freed by emergency personnel.     Assisting, at the location, were Farmington Township fire-rescue, along wih both Famington Township and Clarion Hospital ambulance crews, plus a Clarion based Stat Medevac helicopter unit.