High cards in royal flushes (4)

I believe the answer is:

aces

(Other definitions for aces that I've seen before include "that are non-returnable" , "They're high and low on cards" , "passes with flying colours in US" , "Two will make deuce" , "Case of top cards" .)

I've seen this clue in the USA Today.

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.