I used Audacity for this. It can be a better tool for this exact error. Best of all, it's freeware.
I took a noise profile from the noise clip, which is what you want to do -- save a small noise-only clip.
Then File > Open the other clip that you want to filter. It must be File > Open, don't drag and drop! Here, it was kid talking.
I ran the filter at 18 strength, and left everything else default.
In Sound Forge
, normalize. And repeat in Audacity if needed.
There's still some buzz/hum left because your noise print was not 100% (1:1) to the audio clip used
This was an easy one, even when one handed!