Answer:

LOCO

Answer	Crossword Clue
LOCO	In .. parentis
LOCO	Insane
LOCO	Weed or motive starter

LOCO	Plumb crazy
LOCO	Touched
LOCO	Off one's trolley
LOCO	Crazy, in Texas
LOCO	Bats
LOCO	Bonkers
LOCO	Crackers or nuts
LOCO	Bananas

LOCO	Haywire
LOCO	In ... parentis
LOCO	Berserk
LOCO	In ... parentis: acting as a parent
LOCO	Mad
LOCO	Off one's rocker
LOCO	Touched in the head
LOCO	Not all there

LOCO	Crazy as a loon
LOCO	Nuts
LOCO	Screwy
LOCO	Daffy
LOCO	Nuts or crackers?
LOCO	Crackers
LOCO	Off one's rocker, and a hint to what the four longest puzzle answers have in common
LOCO	Not right in the head

LOCO	Out of one's gourd
LOCO	Prefix with weed or motion
LOCO	Bats or bonkers
LOCO	Off your rocker
LOCO	Crazy, in Cozumel
LOCO	Crazy
LOCO	In ... parentis (acting as mom or pop)
LOCO	Bananas, nuts, or crackers

LOCO	Crazy in la cabeza
LOCO	Cuckoo, in Cancún
LOCO	Wacky
LOCO	Crazy, in Cancún
LOCO	Cuckoo