TPA LCL CTLR RESCINDS INTXN TKOF TO DHC8 FLC RECOGNIZING THAT INTXN TKOFS AFTER SUNSET ARE NOT AUTH.

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TPA RWY 18R TXWY BLOCKED DUE TO CONSTRUCTION. ALL DEPS USING INTXN W6 FOR TKOF. WHILE HOLDING SHORT; WE GOT (I HEARD) 'POS AND HOLD;' AND THE FO READ THAT BACK. I STARTED MOVING THE ACFT ONTO THE RWY AS WE DID THE TKOF CHKLIST. ALMOST IMMEDIATELY; THE TWR STARTED TALKING AGAIN. SOMETHING TO THE EFFECT THAT HE COULD NOT ISSUE A POS AND HOLD CLRNC AT AN INTXN AT NIGHT AND FULL LENGTH AVAILABLE; OR SOMETHING TO THAT EFFECT. I IMMEDIATELY STOPPED THE ACFT JUST OVER THE HOLD SHORT LINE; TOLD THE TWR WE WERE PAST IT; AND ASKED FOR A CLARIFICATION OF THE CLRNC. HE CAME BACK WITH MORE VERBIAGE THAT WE HAD NO IDEA WHAT HE WAS TALKING ABOUT. HE THEN CLRED US AGAIN ONTO THE RWY AND THEN FOR TKOF. WE HAVE BEEN ISSUED 'POS AND HOLD' AT NIGHT MANY TIMES. WE STARTED OUT WITH WHAT I THOUGHT WAS A CLR CLRNC TO POS AND HOLD; BUT AFTER A MIN OR 2 OF TWR TALKING; I CAME TO DOUBT THAT WAS THE CASE. I DON'T KNOW IF WE CUT OUT PART OF HIS XMISSION OR WHAT. AT ANY RATE; WE DID LOOK FOR ANYTHING ON FINAL APCH BEFORE MOVING THE ACFT AND TWR DID STATE THAT WE WERE OK; BECAUSE HE HAD NOTHING ON FINAL.'