Adviser Says Clinton Will Admit Relationship
Pres Clinton's senior advisers reportedly secure his agreement to acknowledge to Federal grand jury that he engaged in inappropriate physical relationship with former intern, Monica S Lewinsky, but he reportedly will deny that he counseled her or anyone else to lie about relationship; Clinton will reportedly say he did not commit perjury in earlier sworn deposition in Paula Corbin Jones sexual misconduct lawsuit, when he denied affair with Lewinsky; lawyers involved in case say prosecutors are seeking more than Presidential admission of extramarital activity, noting they have spent past seven months investigating whether he engaged in obstruction of justice, subornation of perjury or witness tampering; senior White House official says Clinton may deliver brief address to nation following grand jury appearance; David E Kendall, Clinton's private lawyer, scores 'groundless speculation' about President's testimony; says he will testify truthfully; White House official says Clinton is confident, is fully prepared and will tell truth; Sen Orrin Hatch, Senate Judiciary Committee chairman, says Clinton is likely to survive admission of sexual relationship with Lewinsky as long as he testifies truthfully, but that if he lies it would be grounds for impeachment; photos (M)