Because the basemap is a JPG file, you can't use clip directly. Instead, you should use Extract by Mask to crop a raster map (JGP) with vector planes.

(1) firstly, the red line is converted into an area file, and the feature is transformed into a polygon,

② Use the spatial analysis tool in the toolbox-Extract-Extract by Mask.

③ Set the input grid selection grid diagram (JGP) in ③ extraction by mask.

The mask data selects the area into which the red line is converted.