Develop the photo twice in your RAW converter. Once for the subject, and once to make the part of the background that you don't like closer to the tones you do like.
Now with both images in photoshop, drag the one where you fixed the background on top of the other photo (while holding down the shift key).
Now add a layer mask but hold down the Alt key (on PC) when you create the mask which will give you a black mask. Now only the background photo shows.
Press D to select white/black as the fore and background colors and choose a soft brush and paint in using white the area that you want corrected. If you make a mistake, use black to by painting over the mistake.