Answer:

MULE

Answer	Crossword Clue
MULE	Obstinate one
MULE	One of twenty on a team
MULE	Francis

MULE	Smuggler
MULE	Stubborn one
MULE	Francis of the movies, for one
MULE	Francis was a talking one
MULE	House slipper
MULE	Stubbornness symbol
MULE	Epitome of obstinacy
MULE	Pertinacious one

MULE	Grand Canyon transport
MULE	Backless lounging slipper
MULE	Grand Canyon site
MULE	Lounging slipper
MULE	Pack animal
MULE	Sure-footed critter
MULE	Type of slipper
MULE	Horse and donkey's offspring

MULE	Prospector's beast
MULE	Stubborn critter
MULE	Backless shoe
MULE	Plow puller
MULE	Slip-on slipper
MULE	Grand Canyon sight
MULE	Slipper choice
MULE	Backless footwear

MULE	One who's tough to budge
MULE	Backless slipper
MULE	Stubborn beast
MULE	Stubborn animal
MULE	West Point mascot
MULE	Its daddy is a donkey
MULE	Symbol of stubbornness
MULE	Talkative Francis, for one

MULE	Driven animal
MULE	Kind of deer
MULE	One who won't budge
MULE	Paradigm of stubbornness
MULE	Sterile pack animal

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.