Flesh and Fury

Yes, there is a "bad" blonde babe in this film who exploits the innocent pugilist main character, but otherwise this story falls more squarely in the realm of melodrama than film noir. Still worth a look, especially for the mid-50s milieu of the grimy boxing palaces that would be apotheosized thirty years later in Martin Scorsese's Raging Bull.

(EDIT, Feb '22): When I wrote the above the film still had "Film Noir" included on the main page as a genre' tag for the film. It has since been removed. And no, I didn't request the change...evidently somebody else agreed with me.