INSTRUCTOR WITH INST STUDENT MAKES APCH WITHOUT CLRNC.

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FILED FLT PLAN WITH FSS. IN REMARKS I EXPLAINED IT WAS AN IFR TRAINING FLT AND WAS ROUTING NEEDLES - PRESCOTT - SCOTTSDALE AND WAS INTENDING TO DO AN ILS AT PRESCOTT AND GO MISSED APCH AND CONTINUE FOR SCOTTSDALE. IN THE AIR I WAS IN CONTACT WITH ZLA WHO CLRED ME AS FILED. WHEN I ARRIVED OVER DRAKE VOR AT 11000 FT I STARTED THE ILS APCH GOING OUTBOUND FOR THE PROC TURN TO ESTABLISH; AND I BEGAN A DSCNT DOWN TO 10000 FT WITHOUT CLRNC. ZAB WAS NOT AWARE OF MY INTENTIONS AND HAD NOT CLRED ME FOR THE APCH. I CONTACTED PRESCOTT TWR AND WENT MISSED APCH BACK TO DRAKE VOR AND CONTINUED FOR SCOTTSDALE. THE CAUSE WAS MY BELIEF THAT BECAUSE I HAD FILED FOR THE ILS APCH THAT THE INFO HAD BEEN PASSED ON TO ZAB. I ASSUMED THEY KNEW MY INTENTIONS AND PROCEEDED WITHOUT CLRNC FOR THE APCH (DSNDING WITHOUT CLRNC). ALSO IT WAS A LACK OF AWARENESS ON MY PART THAT I HAD NOT BEEN CLRED. NO TFC CONFLICTS OR NEAR MISSES OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WAS ASKED TO CONTACT ATC AFTER LNDG. HE DID AND WAS GIVEN A REVIEW OF PROCS. ATC INDICATED NO RPT WOULD BE FILED. RPTR SAYS HE DID GET A HDOF TO ZAB AND WAITED FOR HIS CLRNC FOR THE APCH. RECEIVING NONE; HE JUST PROCEEDED TO MAKE THE APCH. SAYS IT WAS A CASE OF MISCOM. ANALYST PROBED TO DETERMINE IF HE HAD HAD ANY DISCUSSION WITH OTHER FLT INSTRUCTORS WHICH INDEED HE HAD. HE NOW KNOWS PROPER PROCS AND CLAIMS THIS WILL NEVER HAPPEN AGAIN. THIS WAS HIS FIRST XCOUNTRY INST FLT AS AN INSTRUCTOR AND HE WAS QUITE NERVOUS. ACFT WAS A C172.