Answer:

obsession

Answer	Crossword Clue
OBSESSION	Calvin Klein fragrance
OBSESSION	Hang-up
OBSESSION	Fixed ideas.

OBSESSION	Monomaniac's problem
OBSESSION	1994 biography of Calvin Klein
OBSESSION	Calvin Klein perfume
OBSESSION	A lot of thought goes into it
OBSESSION	Persistent thought

Crossword

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