Holiday Affair (1949)

Just before Christmas, department store clerk Steve Mason meets big spending customer Connie Ennis, really a commercial spy. He unmasks her but lets her go, which gets him fired. They end up on a date, which doesn't sit well with Connie's steady suitor, Carl, but delights her son Timmy, who doesn't want Carl for a step-dad. Standard (if sweet) romantic complications follow.