Crossword Genius

Most popular at the box office and thoroughly U (3,6)

Ross

I believe the answer is:

top drawer

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

'u' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for top drawer that I've seen before include "The very best" , "upper class" , "Highest level of society" , "Highest social position - or sliding furniture box" , "Highest social position - a furniture metaphor" .)

I've seen this clue in the Evening Standard.
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.