B737-300 ACFT DSNDING ON CIVET ARR AND CLRED FOR ILS APCH. FLC MISUNDERSTOOD CLRNC AND DSNDED BELOW XING RESTR ALT BY 700 FT. RPTR FO STATES THAT BECAUSE HE WAS ON PROBATION; HE DIDN'T CHALLENGE CAPT'S COMMENTS ABOUT KNOWING WHAT HE WAS DOING.

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WHILE DSNDING INTO LAX VIA CIVET 1 ARR; WE WERE CLRED FOR THE ILS RWY 25L. INTERCEPTED LOC AND TRACKED IT WHILE DSNDING. SOCAL APCH THEN CLRED US TO CROSS HUNDA INTXN AT OR ABOVE 3500 FT. WE INTERPRETED THIS AS THE ONLY RESTR ON THE APCH. DUE TO ACFT WT AND NUMEROUS SPD RESTRS ISSUED BY SOCAL; THE CAPT ELECTED TO BEGIN DSCNT EARLY FOR HUNDA XING ALT. WE CROSSED HUNDA AT 3600 FT AND MADE NORMAL VISUAL APCH AND LNDG. GND CTL REQUESTED THAT WE CONTACT SOCAL BY PHONE WHO NOTED THAT WE CROSSED FUELR INTXN AT 7300 FT RATHER THAN 8000 FT AS DEPICTED ON ILS RWY 25L APCH PLATE. I BELIEVE THIS MISUNDERSTANDING TO BE CAUSED BY THE VAGUE INSTRUCTIONS ISSUED BY SOCAL APCH. IF SOCAL HAD BEEN MORE EXPLICIT ON THE TERMINOLOGY; THEN THE CREW WOULD HAVE HAD NO DOUBT THAT WE WERE TO STAY ON THE GS ENSURING ALL XING RESTRS WOULD BE COMPLIED WITH. WE WERE UNSURE AS TO OUR CLRNC BUT DUE TO FREQ CONGESTION WE WERE DISCOURAGED FROM CLARIFYING THE INSTRUCTIONS. IN ADDITION; THE CAPT'S NUMEROUS ASSERTIONS TO THE FO THAT HE 'KNEW WHAT HE WAS DOING' PREVENTED THE PROBATIONARY FO FROM CHALLENGING THE CAPT ON HIS DSCNT PROFILE. SUPPLEMENTAL INFO FROM ACN 375479: MY UNDERSTANDING IS; WHEN GIVEN A NEW XING RESTR; IT VOIDS ANY PRIOR RESTR; UNLESS PRIOR RESTRS ARE GIVEN IN THE NEW CLRNC.