NEW YORK -- Twenty-one is one of those numbers that carries a
little extra meaning in the eye of the beholder. It can be
blackjack, it's the legal age to buy a beer at Yankee Stadium,
and -- for many fans -- it's Paul O'Neill.  Morgan Ensberg felt
so uncomfortable wearing No. 21 in Spring Training, shocked at
the amount of heat he received, that he abandoned his exhibition
digits in favor of No. 11.  Reliever LaTroy Hawkins moved
quickly to snap up the number, and he had another reason -- as a
tribute to Roberto Clemente.  "I'm a fan of a lot of the guys
who have played the game," Hawkins said. "Clemente stands out
because of what he stood for and what he died doing. That was
pretty impressive. He died the month I was born, and I was born
on Dec. 21."  Clemente was killed in a plane crash on Dec. 31,
1972. The Pirates outfielder had volunteered to help deliver
relief supplies to earthquake-ravaged Nicaragua, and his digits
were officially retired in Pittsburgh on Opening Day 1973.  For
the Yankees, No. 21 was