ACR B737 FLC ACCEPT APCH CLRNC; NOT UNDERSTANDING ISSUED RESTR AND CONDUCT APCH AS THEY INTERP THE CLRNC. FLT LANDS WITHOUT INCIDENT.

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COMING INTO LOVE FIELD; WE (X) WERE CLRED FOR THE VISUAL APCH TO RWY 13R; FOLLOWING COMPANY TFC (Y) WHO WAS TURNING A R BASE IN FRONT OF US. THE CALL FROM THE CTLR WAS (AND I PARAPHRASE) '(X) CALL SIGN; CLRED THE VISUAL BEHIND COMPANY (Y); MAINTAIN 3000 FT UNTIL (BLANK).' WE WERE NOT TOTALLY SURE WHERE WE WERE SUPPOSED TO MAINTAIN 3000 FT. IT SOUNDED LIKE THE CTLR SAID 'MAINTAIN 3000 FT UNTIL ADDISON;' BUT THAT DID NOT MAKE A WHOLE LOT OF SENSE BASED ON OUR LOCATION. AS WE WERE DISCUSSING THIS; AND KEEPING AN EYE OUT FOR THE TFC IN FRONT OF US; WE WERE TOLD TO CONTACT TWR. WE WENT OVER TO TWR; HELD 3000 FT UNTIL NEEDED FOR SAFE APCH; AND LANDED UNEVENTFULLY. A COUPLE OF LESSONS LEARNED: ANYTIME A CLRNC IS NOT FULLY UNDERSTOOD BY BOTH CREW MEMBERS; QUERY THE CTLR. (APCH WAS RATHER BUSY AT THE TIME -- WE SHOULD NOT HAVE GONE TO TWR UNTIL WE WERE SURE WHAT THE CTLR WANTED.) ALSO; WE DID NOT READ BACK THE CLRNC. I ALWAYS TRY TO READ BACK ALL CLRNCS. MY CAPT WAS WORKING THE RADIO AND DID NOT READ BACK THE CLRNC; PROBABLY SINCE IT WAS NOT UNDERSTOOD. FINALLY; NO MATTER HOW BUSY A CTLR IS; A REQUEST TO REPEAT THE INSTRUCTIONS SHOULD ALWAYS BE MADE.