a/one smart cookie
A clever and intelligent person. Don't underestimate Cindy's intelligence—she's one smart cookie!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a smart cookie
If someone is a smart cookie, they are clever and have good ideas. Anyone who made billions in the Russian oil industry is clearly a smart cookie. Helen's a pretty smart cookie — I trust her.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
a/one smart ˈcookie(American English, informal) a clever person with good ideas: Jed is one smart cookie. I’m sure he’ll do the right thing.
Farlex Partner Idioms Dictionary © Farlex 2017
n. a clever person. She’s really a smart cookie if you give her a chance.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.