Answer:

tidiest

Answer	Crossword Clue
TIDIEST	Most orderly
TIDIEST	Most spick-and-span
TIDIEST	Shipshape to the max

TIDIEST	Most like Felix Unger's room
TIDIEST	Least cluttered
TIDIEST	Like the maximum sum
TIDIEST	Least jumbled
TIDIEST	Neatest.
TIDIEST	Most precise.
TIDIEST	Most meticulous
TIDIEST	Most precise

TIDIEST	Most trim
TIDIEST	Most shipshape
TIDIEST	Most well-kept
TIDIEST	Like the perfect homemaker's home
TIDIEST	Largest, as a sum
TIDIEST	Most like Felix Unger
TIDIEST	Least slovenly
TIDIEST	Neat to the max

TIDIEST	Least messy