Crossword puzzle clue "a hat's is often round"

"I'll chase him round Good Hope, and round the Horn, and round the Norway Maelstrom" speaker of fiction

A hat's is often round

He wore a top hat in "Top Hat"

Dancer with a Cat in the Hat hat and pacifier, maybe

Hat dance hat

Substance under Little Cat Z's hat in "The Cat in the Hat Comes Back"

Woman's round hat (containing tablets?)

Round brimless hat worn on the crown of the head