ZOB CTLR ASSUMES E135 PLT UNDERSTANDS WHAT THE CTLR WANTS WHEN A CLRNC WAS ISSUED.

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I WAS SPACING THE B733 BEHIND THE E135. I TOLD THE E135 TO 'KEEP YOUR SPD UP' (IMPROPER PHRASEOLOGY). HE SAID HE'D BEEN ASSIGNED 280 KTS PREVIOUSLY. I TOLD HIM TO DISREGARD THAT RESTR AND RETURN TO NORMAL OR GREATER; 'THE FASTER; THE BETTER.' THE B733 WAS TOLD TO REDUCE TO 290 KTS OR LESS; WHICH WAS ABOUT HIS CURRENT SPD. THE B733 WAS VECTORED UNTIL HE WAS 6 MI IN TRAIL AND 30 KTS SLOWER IN GND SPD THAN THE E135. THEN; THE B733 WAS TURNED BACK ON COURSE. I WATCHED THE SPDS TO MAKE SURE THEY WERE STILL WORKING; BUT THEN GOT INVOLVED WITH ANOTHER ACFT (Z). WHEN CONFLICT ALERT WENT OFF; I SAW THE E135 HAD SLOWED. I REDUCED THE B733'S AIRSPD AND TURNED HIM AGAIN. I THEN ASKED THE E135 IF HE WAS STILL AT 'BEST FORWARD AIRSPD.' HE REPLIED 'NO; WE THOUGHT YOU WANTED US AT 250 KTS AT CXR.' THAT IS THE STANDARD XING RESTR FOR JETS INBOUND TO CLE OVER CXR. I TOLD HIM 'NO; I NEVER GAVE YOU THAT BECAUSE YOU'RE BEING OVERTAKEN BY ANOTHER ACFT. I NEED YOU FAST.' HE REPLIED THAT HE WAS 'PICKING IT BACK UP.' I BELIEVE THAT ALTHOUGH I DIDN'T USE CORRECT PHRASEOLOGY ON THE E135; WITH THE CLARIFICATION; I MADE IT KNOWN THAT I DID NOT WANT THE E135 SLOWED. HOWEVER; WITH THE NORMAL 250 KTS AT CXR; MANY OF THE PLTS HAVE BEEN SLOWING APCHING CXR IN ANTICIPATION OF THIS RESTR. IT SURPRISED ME IN THIS CASE BECAUSE I HAD SPECIFICALLY TOLD THIS ACFT I WANTED HIM GOING FAST.