I used the Razor tool in Openshot to remove a scene from a movie. However, the transition between the two surrounding scenes is now very choppy. The movie is now simply two separate clips. Is there a way to "fuse" the two clips together, so the transition is smooth?
The two most common approaches, if you don't have B-roll coverage, is either a dissolve (usually a cross-dissolve) or a fade-out/fade-in (usually dip-to-black). Garish effects (essentially all the others offered in a typical NLE) can also be used (but are usually avoided).
IF the clip you are cutting out means joining what looks like a single take (with a discontinuity in the middle), the dip is your friend. If the clip you are cutting out takes you from one scene to another, the cross dissolve can also work. A series of cross-dissolves can work to show the passage of time (where the camera stays fixed and the subject is seen doing on thing, fading into doing another, etc.).