PA34T IN WX ACCUMULATES ICE; PLT TAKES ANOTHER ACFT'S FREQ CHANGE AND DSNDS WITHOUT CLRNC.

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AT ABOUT 5000 FT; WAS GIVEN HDG 180 DEGS AND CLRED TO 3100 FT. AT THIS TIME WAS IN A RAIN-ICE PELLET SHOWER. WINDSCREEN GLAZED OVER; ACTIVATED PROP HEAT AND HOT PLATE. PITOT HEAT ON SINCE DEP. AUTOPLT WOULD NOT RESPOND TO DSCNT COMMAND -- HAD TO DISENGAGE. ELECTRIC TRIM FROZEN; COULD NOT MOVE TRIM WHEEL. HAD TO USE HVY CTL INPUT TO FORCE DSCNT. (TURN WAS FOR LEVEL FLT PRIOR TO ICING.) CTLR CALLED THE FIELD '12 O'CLOCK AND 4 MI.' I RESPONDED I HAD FIELD IN SIGHT. I THEN HEARD 'CLRED VISUAL; POINT SEVEN.' I ASSUMED THIS WAS FOR ME; SWITCHED TO ADVISORY FREQ; DSNDED TO PATTERN ALT 2000 FT; AND ON DOWNWIND SWITCHED BACK TO LAN APCH AND ANNOUNCED I WAS IN THE PATTERN AND WOULD LIKE TO CANCEL. CTLR ACKNOWLEDGED CANCELLATION AND GAVE NUMBER TO CALL WHEN ON GND. HE STATED HE 1) DID NOT CLR ME FOR THE VISUAL; AND 2) BECAUSE I DID NOT DSND TO 3100 FT IN A TIMELY MANNER HE HAD TO DIVERT A FLT APCHING LAN. I EXPLAINED THE ICING PROB. HE SAID IN THE FUTURE TELL CTLR IF THERE IS A PROB. VISUAL CLRNC WAS FOR ANOTHER ACFT. MY XMISSION OF FIELD IN SIGHT WAS APPARENTLY BLOCKED.