Would This Be An Error Penny (2017 P) Missing Clad?

If the copper plating were missing, it would be just the zinc core and a grey colour.
Yours shows a copper colour.

Again, I agree with the above.

@co, copper reacts to different chemicals by turning different colors (e.g. the Statue of Liberty having a lovely green patina). While we don't know the specific chemical or environment that your cent was exposed to, we do know that it affected the color. So yes this is not a mint error.

I agree with Spence, environmental staining/discolooration is the issue. There are so many possible chemicals that your coin could have come in contact with it's difficult to say how/why, but it's not a value enhancement, sorry.

Plating and cladding are two different processes. To say a plated is missing its cladding is like advertising a Bicycle without a roof over it. (it never had one to begin with)
To tell if it is cladding, you look at the edge of the coin to see the copper layer that the cladding is hiding.
To tell if it is plating, you look at the edge to see if the copper plating is there. (I know that sound like a dumb response, but on a faked error, will show the zinc area if the coin was cut)
A faked one will show the gray zinc color if it was faked:

On the real straight clip, the plating will be covering the edge of the affected area on the coin:

The plating happens after the cutting/setup process: