I'd like one of my headers to have a slight drop shadow effect. But I don't want to have to put it in a seperate text frame as the body text (which I do not want to have a shadow).
So is there any way to apply a drop shadow to just the Header text in a text frame, but leaving the body text without a shadow?
No, it's impossible to select a part of the text with the "text-tool" and apply an effect.
Drop Shadow is an effect which can be applied only to whole frames on Object, Area, Stroke and Content Level.
It is not possible to apply it to a pragraph style.
BUT what you could do is, set the letters, words or even paragraphs in its own frame, copy that into the clipboard, and paste it with the selected text tool inside the text, so it becomes an anchored framed, to this anchored frame you can apply any effect which you want and which is available.