Crossword Genius

Something frivolous from female Pulitzer Prize winner (5)

Ross

I believe the answer is:

froth

I'm a little stuck... Click here to teach me more about this clue!

'winner' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for froth that I've seen before include "Spume or foam" , "Mass of small bubbles" , "Effervesce" , "Small bubbles on a liquid" , "Lather" .)

I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.