Identification of Bird feather, probably from a predatory bird

This is a Common Kestrel (Falco tinnunculus) primary wing feather, so it is indeed from a predatory bird. The orange hue suggests that this came from a juvenile and/or female individual. Featherbase provides a good reference here.

For future feather identification questions, you may wish to post them to the Found Feathers project on iNaturalist.