SMA ON PRACTICE INST APCH BREAKS OFF AS INSTRUCTED TO PARALLEL RWY TO THE L. ACFT CLRED TKOF OPPOSITE DIRECTION TO MAINTAIN RWY HDG BUT TURNS AT 100 FT. NMAC.

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WHILE FLYING A PRACTICE ILS AT TRENTON ARPT TO RWY 6; I WAS TOLD BY TWR TO RPT XING THE DELAWARE RIVER. AFTER RPTING OVERHEAD THE RIVER; TWR TOLD ME FLY OVERHEAD THE ARPT AND TO THE L OF CENTERLINE OF RWY 6. I FOLLOWED THOSE INSTRUCTIONS IMMEDIATELY AND READ BACK 'BREAKING OFF THE LOC AND WILL REMAIN WELL W OF THE CENTERLINE OF RWY 6'. TWR ACKNOWLEDGED MY READBACK AND THEN CLRED AN SMT INTO POS AND HOLD ON RWY 24. THE SMT WAS ADVISED BY TWR THAT I WAS ON FINAL BUT WOULD BE CLR OF THE CENTERLINE. THE SMT WAS INSTRUCTED TO MAINTAIN RWY HDG AFTER TKOF AND TO COMPLY WITH NOISE ABATEMENT PROCS. THE SMT PLT ACKNOWLEDGED THE INSTRUCTIONS AND STARTED HIS TKOF ROLL. AT THIS POINT I WAS WITHIN THE PERIMETER OF THE ARPT AND ABOUT 2000 FT L OF THE CENTERLINE OF RWY 6. AFTER TKOF THE SMT MADE A STEEP R TURN AT ABOUT 100 FT AND FLEW ALMOST DIRECTLY BENEATH MY ACFT. I NOTIFIED TWR THAT THE SMT IS IN A R TURN AND I MADE A R BANK IN ORDER TO KEEP THE SMT IN SIGHT. WE HAD ABOUT 400 FT OF VERT SEPARATION. THE SMT PLT CLAIMED THAT MY ACFT WAS DIRECTLY IN FRONT OF HIM AND THAT HE WAS TAKING EVASIVE ACTION. TWR'S RESPONSE WAS THAT THE SMT DID NOT FOLLOW INSTRUCTIONS AND THAT THERE WAS NO CONFLICT WITH MY ACFT. THE SMT PLT BECAME VERY ARGUMENTATIVE AND NEVER DID FOLLOW TWR'S INSTRUCTIONS. THIS WAS NOT A NEAR MISS INCIDENT IN MY ESTIMATION BUT IT VERY EASILY COULD HAVE BEEN. HAPPILY I HAD LEVELED OFF ABOUT 200 FT ABOVE CIRCLING MINS SO WE HAD ADEQUATE VERT SEPARATION. TRENTON TWR WAS 'HEADS UP' DURING THIS EXPERIENCE AND DESERVES TO BE COMMENDED. THE SMT PLT WAS CLRLY IN THE WRONG AND FAILED TO COMPLY WITH AN ATC CLRNC THAT HE HAD ACKNOWLEDGED RECEIVING AND FAILED TO QUESTION.