Answer:

elis

Answer	Crossword Clue
ELIS	Bush and Clinton, once
ELIS	Ivy League team
ELIS	Yale Bowl squad

ELIS	"Boola Boola" singers
ELIS	Bulldog backers
ELIS	Clinton and Bush, e.g.
ELIS	Yalies
ELIS	Ivy League group
ELIS	Yale boosters
ELIS	Wallach and Whitney
ELIS	Connecticut collegians

ELIS	Ivy Leaguers
ELIS	Some Ivy Leaguers
ELIS	New Haven enrollees
ELIS	Harvard's football foes
ELIS	New Haven students
ELIS	Bulldogs
ELIS	Crimson rivals
ELIS	Manning and Whitney

ELIS	Yale students
ELIS	Skull and Bones members
ELIS	"Bright College Years" singers
ELIS	Yale Bowl spectators
ELIS	Ancient Olympic Games site
ELIS	Big Green opponents
ELIS	Both Bushes
ELIS	New Haven collegians

ELIS	Yale alumni
ELIS	Bush and others
ELIS	Whitney and Wallach
ELIS	Hillary and others
ELIS	The Whiffenpoofs of a cappella fame
ELIS	Yale Bowl cheerers
ELIS	"The Whiffenpoof Song" collegians
ELIS	Bush's undergraduate classmates

ELIS	Yale Bowl rooters
ELIS	Yale grads
ELIS	Both Bushes, college-wise
ELIS	Yale folk
ELIS	"Boola Boola" collegians