Backstab outlet with one wire screwed in?
You should use either side-screws, or backstabs, but not both at once.  And you should never use backstabs, according to many of us!  I just had to deal with a broken switch where the backstab was the core cause. 

If you really need to connect 3 wires, you can pigtail.  

Or, consider the $3 "screw-and-clamp" types such as Leviton that are sold at home-improvement stores and electrical supply.   They look like backstabs except the holes are directly aligned with the screws.  Aside from using the screws the normal way, you can screw down to clamp 1 or 2 wires in the holes behind the screw. So with two screws, you can connect up to 4 wires per side.