Answer:

man

Answer	Crossword Clue
MAN	Checker piece
MAN	Chess queen, strangely, enough
MAN	To a .. (without exception)

MAN	"I'm a ..." (Bo Diddley hit)
MAN	"Wow!"
MAN	Superhero suffix
MAN	... overboard!
MAN	Fit out
MAN	Game piece
MAN	Staff
MAN	Bat or Super ender

MAN	"Sheesh!"
MAN	Food's opponent, on a Travel Channel eating show
MAN	Certain adult
MAN	Million ... March (event in "Get on the Bus")
MAN	Word meaning anyone who's ever lived, if you ask the patriarchy
MAN	British isle
MAN	Part of BMOC
MAN	Isle of ..

MAN	He
MAN	Answer to the Sphinx's Riddle
MAN	Sphinx riddle answer
MAN	Dude
MAN	Chess piece
MAN	Sphinx's riddle answer
MAN	Shaw's "Arms and the ..."
MAN	End of the natural progression

MAN	"The only animal that blushes," per Twain
MAN	"God created the integers; all the rest is the work of ...": Kronecker
MAN	"A ... for All Seasons"
MAN	Fellow
MAN	Chap
MAN	Guy
MAN	Sixth-day creation
MAN	"Gee!"

MAN	"Oh, brother!"
MAN	Gentle one?
MAN	"... the only animal that blushes. Or needs to.": Twain
MAN	"Holy cow!"
MAN	Queen in chess, ironically