Answer:

nit

Answer	Crossword Clue
NIT	Coll. basketball tourney
NIT	Hoops tourney, for short
NIT	This isn't welcome in school

NIT	Little louse
NIT	Nottingham nerd
NIT	NCAA tourney's lesser cousin
NIT	Prefix for wit
NIT	One of the basketball tournaments
NIT	Pick of a fault-finder?
NIT	March hoops event (abbr.)
NIT	Something to pick

NIT	Tiny criticism
NIT	Quibble
NIT	Item picked
NIT	Egg of a louse
NIT	Petty complaint
NIT	Tiny louse
NIT	Proverbial item to pick
NIT	Future louse

NIT	Louse egg
NIT	Imbecile, in British slang
NIT	Postseason college-basketball competition
NIT	Silly fellow
NIT	Minor flaw
NIT	Fool, in Folkestone
NIT	Postseason hoops competition, for short
NIT	Insignificant detail

NIT	N.Y.C. college basketball event
NIT	Tiny insect
NIT	Critic's pick?
NIT	College hoops event, initially
NIT	Complaint that's "picked"
NIT	Minor criticism
NIT	"Picked" picayune point
NIT	It's hardly worth picking

NIT	Picker lead-in
NIT	Small point
NIT	Trivial point to pick
NIT	Wit and pick lead-in
NIT	Dunderhead, in Dover