LTT MISSES HOLD SHORT PORTION OF TAXI CLRNC. FORCES GAR OF SECOND ACFT.

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UPON LNDG AT CLE RWY 23R WE UNDERSTOOD THAT WE WERE CLRED TO CROSS 23L AND CONTACT GND UPON CLRING 23L. AFTER CLRING AND CONTACTING GND WE WERE INSTRUCTED TO CALL THE SUPVR. AFTER THE CAPT CALLED WE WERE TOLD THAT WE WERE INSTRUCTED TO HOLD SHORT OF 18 AND STAY WITH THE TWR CTLR. WE DIDN'T RECEIVE OR UNDERSTAND THAT CLRNC AND THEREFORE FORCED AN ACFT TO DO A GAR WHEN WE CROSSED 18. I BELIEVE THIS COULD HAVE BEEN AVOIDED IF TWR WOULD MAKE SURE WE (PLTS) UNDERSTOOD ALL CLRNC AND THAT CLRNC'S THAT INVOLVE OTHER ACFT SHOULD BE CONVEYED TO THE CREWS AT TIMES OTHER THAN SLOWING AN ACFT ON LNDG ROLL. I ALSO BELIEVE BETTER RWY MARKINGS WITH HOLD SHORT AND RWY SIGNS MIGHT HAVE AIDED US. SUPPLEMENTAL INFO FROM ACN 201208: I SUSPECT THAT THE TWR MAY HAVE INSTRUCTED ME TO HOLD SHORT OF RWY 18 WHILE I WAS CHANGING FREQ FROM TWR TO GND CTL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE FEELS CTLRS OUGHT TO BE AWARE OF COCKPIT NEED FOR NO DISTR ON LNDG ROLL OUT. DO NOT ISSUE INSTRUCTIONS UNTIL ACFT INITIATING TURN OFF OF RWY. IF REASON TO HOLD SHORT; NOTIFY FLC WITH ADVISORY TO ASSURE UNDERSTANDING. AT INTXNS THERE ARE NO HOLD LINES INDICATING THERE IS A RWY. YELLOW TAXI LINES CONTINUE ON ACROSS A RWY! OFTEN CANNOT SEE TAXIWAY SIGNS. OTHER ACFT WAS COMPANY PLANE AND CREW TOLD RPTR THERE WAS NO NEED TO GAR; HAD ENOUGH SPACING.