B767 CAPT TAXIED PAST HOLD LINE MISTAKENLY BELIEVING THAT HE HAD BEEN CLRED INTO POS AND HOLD. ANOTHER ACFT WAS SENT AROUND.

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WHILE TAXIING TO RWY 25R ON TXWY B AT LAX; I THOUGHT I HEARD THE TWR CTLR GIVE US A CLRNC TO 'POS AND HOLD FULL LENGTH RWY 25R.' WE WERE PASSING TXWY F WHEN WE WERE GIVEN THE ALLEGED CLRNC. I TAXIED JUST BEYOND THE HOLD SHORT LINE BUT NOT ON THE RWY AND STOPPED. FO QUESTIONED WHETHER OR NOT WE WERE CLRED ON THE RWY. I ALSO SAW AN AIRPLANE ON ABOUT A 4 MI FINAL FOR RWY 25R. AFTER QUESTIONING OUR CLRNC WITH TWR; WE WERE TOLD WE WEREN'T GIVEN A CLRNC TO POS AND HOLD; AND TWR DIRECTED THE AIRPLANE ON FINAL TO GO AROUND. WE WERE FINALLY GIVEN PERMISSION TO TAKE OFF FROM OUR PRESENT POS AND CONTINUED TO DFW WITHOUT ANY FURTHER INCIDENT. WE WERE GIVEN A NUMBER TO CALL LAX TWR AND WHEN I SPOKE TO THE TWR INDIVIDUAL; I WAS TOLD HE REVIEWED THE CONVERSATION ON TAPE. HE SAID THAT NO INSTRUCTIONS WERE GIVEN TO POS AND HOLD. I OBVIOUSLY MISINTERPED THE CLRNC. IN RETROSPECT; I WILL BE MUCH MORE VIGILANT TO ALL CLRNCS AND WILL DOUBLECHK ALL CLRNCS ASSOCIATED WITH A RWY. I DO THINK THE TWR CTLR COULD HAVE HELPED OUT A LOT BY INCLUDING A HOLD SHORT OF RWY 25R IN HIS ORIGINAL CLRNC. THE LAX TWR INDIVIDUAL AGREED THAT IT SHOULD BE AN ITEM TO LOOK INTO.