ACR B727 CROSSES OVER THE HOLD LINE AT DCA IN ANTICIPATION OF A TKOF CLRNC. LNDG ACFT TOLD TO GAR.

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WASHINGTON NATIONAL TWR DIRECTED US 'TO MAKE READY FOR AN IMMEDIATE DEP BEHIND DEPARTING TFC; TAXI UP TO BUT HOLD SHORT RWY 36; TFC TO LAND; ON 4 MI FINAL.' WE ACKNOWLEDGED AND TAXIED UP TO HOLD SHORT RWY 36. AS SOON AS THE DEPARTING TFC WAS CLRED FOR TKOF AND BEGAN HIS TKOF ROLL THE TWR CTLR XMITTED 'ACR X; THE LNDG TFC WILL LAND PRIOR TO YOUR DEP; HOLD SHORT RWY 36.' I (PNF/FO) ACKNOWLEDGED BUT THE CAPT HAD RELEASED THE PARKING BRAKE AND THE NOSE OF THE ACFT CROSSED THE HOLD LINE. WE ADVISED TWR WE HAD CROSSED THE HOLD LINE (THE NOSE WAS APPROX 3 FT ACROSS BUT THE NOSEGEAR HAD NOT CROSSED). WE ATTEMPTED TO ADVISE TWR WE COULD MAKE A 180 DEG TURN INTO THE HOLD AREA BUT TWR DIRECTED THE LNDG ACFT TO GAR. ALTHOUGH WE WERE 'SPRING LOADED' TO MAKE AN IMMEDIATE TKOF; WE DID NOT HAVE CLRNC TO TAKE THE ACTIVE RWY. THE SIT COULD HAVE BEEN AVOIDED IF WE HAD NOT BEEN SO 'SPRING LOADED' AND ABIDED BY OUR CLRNC. ALSO; THE TWR MIGHT HAVE QUERIED US ABOUT TAXIING CLR. TWR DID ASK ACR LNDG TFC IF THEY COULD CIRCLE TO RWY 33; BUT THEY WERE UNABLE. ALSO; IF AN ANTICIPATORY CLRNC IS GIVEN; POSSIBLY TWR COULD HAVE FIRST STATED THE CHANGE; IE; 'ACR X; HOLD SHORT RWY 36. LNDG TFC WILL LAND PRIOR TO YOUR DEP.' SUPPLEMENTAL INFO FROM ACN 367579: TWR ADVISED US TO BE READY FOR AN IMMEDIATE TKOF BEHIND THE PRECEDING ACFT AS I APCHED THE HOLD SHORT LINE. THE PRECEDING ACFT WAS CLRED FOR TKOF. ATC THEN BEGAN A XMISSION TO OUR ACFT. ANTICIPATING AN IMMEDIATE TKOF CLRNC; I DID NOT STOP AT THE HOLD SHORT LINE. HOWEVER; ATC'S INSTRUCTIONS WERE TO HOLD SHORT. I STOPPED THE ACFT; BUT WE WERE ABOUT 6 FT PAST THE HOLD LINE. 2 MAJOR CONTRIBUTING FACTORS: 1) I DEVELOPED THE MINDSET THAT WE WERE GOING TO BE TAKING OFF; AND THAT WE WERE GOING TO NEED TO BE PROMPT. THUS; WHEN THE CTLR BEGAN HIS XMISSION; I ASSUMED THAT IT WOULD BE A CLRNC ACROSS THE HOLD SHORT LINE. 2) THE CTLR'S 'INSISTENCE' THAT WE BE READY FOR AN IMMEDIATE TKOF; ALONG WITH A PAUSE IN HIS XMISSION; 'AIRLINE XXX ... (5 SECOND PAUSE) HOLD SHORT' CONTRIBUTED TO THE CONFUSION. THE RESPONSIBILITY FOR THE INCURSION WAS MINE ALONE; BUT THE CTLR'S INSISTENCE THAT WE BE READY CONTRIBUTED TO THE MINDSET AND THE CONFUSION.