LEWINSKY QUERIED AS CLINTON'S TRIAL ENTERS NEW PHASE
House prosecutor Repr Edward Bryant interviews Monica S Lewinsky under oath and on video tape for nearly four hours in Washington, seeking to bolster obstruction-of-justice charge against Pres Clinton in Senate impeachment trial; questioning marks new and possibly final phase in impeachment trial; White House lawyers offer only apology to Lewinsky, making no inquiries of own; questioning takes far less than eight hours allowed by Senate; White House decision not to use its allotted time suggests no startling new information emerged; deposition attended by Republican Sens Mike DeWine, Arlen Specter and Fred Thompson and Democratic Sens Thomas J Leahy, Christopher J Dodd and John Edwards; all decline comment; photos (M)
