Wiktionary
young gun
n. a new or rising talent or star
Usage examples of "young gun".
What did they call that bunch of young gun waddies Uncle John Chisum and his trading partner, McSween, swore in as unrecognized but efficient lawmen back in seventy-eight?
Dan's head was bobbing up and down so hard that Carlos was sure the young gun would ultimately snap his own neck if the plane hit a turbulence bump.
Maybe she was the local hotshot, somebody who'd moved in after he left, and she was pulling the equivalent of the young gun going after the old gunfighter.
He'd already enjoyed a mild flirtation with a woman who mistook him for some Hollywood young gun.