Crossword puzzle clue "person whose name might start with mc"

Person whose name might start with Mc-

Actor whose first name is the title of a Best Picture he co-starred in, and whose last name is that film's director

Like a person whose BMI might be TMI

Nonsense talk, whose circled letter is the start of what might be done with items in the four longest puzzle answers

Poem whose title might start "To a ..."

New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers

Person whose name is on the envelope

Person whose name appears on a museum plaque, e.g.