CLINTON SUGGESTS HE MAY NOT RESIST FISCAL AMENDMENT
Pres Clinton bows to political reality by softening opposition to Constitutional amendment to balance Federal budget; says he does not believe amendment is necessary but that, if enacted, should be implemented in way that actually works and gives country what it needs to handle recession; defeat of balanced-budget measure by one vote in Senate in '95 after Clinton lobbied against it noted; recent gain of two Senate seats by Republicans has made passage more likely in 105th Congress; Senate majority leader Trent Lott and House Speaker Newt Gingrich say they are in no hurry to act on Clinton's pending proposals to balance budget, overhaul campaign finance laws and to establish commission to address long-term solvency of Medicare (M)