How do you say ? I want show you small video clip?
The clip is three minutes long. I don't want to use the word for movie.

Question

Answer

这个视频短片有三分钟长。我不希望这个词在短片中出现

Answer

I want to show you a small video clip. 我想给你看一小段视频。--我想这么说更符合中文的规则
The clip is three minutes long. 这段视频有三分钟长

Answer

well, we don't need the word movie to translate your sentence.
You can say 这个视频有三分钟长。     视频 is video.  
我想给你看个视频片断。    视频片段：video clip