Answer:

hip

Answer	Crossword Clue
HIP	Cheer starter
HIP	Wise
HIP	Aware of what's what

HIP	Cool
HIP	Savvy
HIP	Trendy
HIP	Nickname of Nintendo music composer Hirokazu Tanaka
HIP	In the know
HIP	Word of cheer
HIP	Kind of boots
HIP	Haunch

HIP	With it
HIP	Aware
HIP	Syllable in cheers
HIP	Holster's place
HIP	Pager's place
HIP	... flask (liquor container)
HIP	Oft-swiveled joint
HIP	Swinging joint?

HIP	Swiveling joint
HIP	Mod
HIP	Hula Hoop spinner
HIP	Not at all nerdy
HIP	Start of a cheer
HIP	Fanny pack spot
HIP	Oft-replaced joint
HIP	One of a swiveled pair

HIP	Common surgical replacement
HIP	"Hooray!" preceder, when repeated
HIP	...-hop
HIP	Exuding coolness
HIP	Like jazz fans, stereotypically
HIP	Swinging
HIP	Up on the latest
HIP	Au courant

HIP	Hooray lead-in
HIP	Cheer leader?
HIP	Not square
HIP	Street-smart
HIP	Joint at the top of the femur