ZipperGate Update...In a deal engineered by veteran mouthpieces Stein and Cacheris, Ms.Lewinsky has apparently headed off possible perjury charges by offering afull throated confession to Kenneth Starr. Sources close to theinvestigation report Starr is pumping Ms. Lewinsky for details concerningan oral pact with Mr. Clinton to withhold evidence. Although theindependent prosecutor's team will drill Monica prior to her testimony,beltway observers do not anticipate a full dress rehearsal.