What shows in the story editor? Is it just the text you expect, or does it also include the overset portion? When you clear the overset text, are you clearing the text frame, or the text itself (selected with the text content tool)? If you just clear the frame, the text stays in the story.
Have you tried exporting as INX and opening that back in CS3?
Several brand-new concepts to me in your post.
Re story editor, parked my cursor on the offending page, clicked View / Story Editor, everything is grayed out. Not so sure what the SE is for, must confess.
"Text content tool" -- I don't see anything named that in my normal panel using float-over tool tips. Do you mean the Type tool?
Not sure what exactly I'm clearing: I've used the Clear command elsewhere w/ good effect, in that overset stuff vanished. Am guessing I'm clearing frame, not text, given it keeps reappearing.
Have seen idea of export to INX in other threads; it looked complex so I did not pursue.
Sorry, you've got a newbie here.
Deleting frames without first deleting the text inside them just puts it back into overset. Story editor is like a word processor in many ways. It will show you the whole story in a scrollable window (and list the styles in use down the left side). Overset text will be inidcated with a red dividing line. If you are sure that there's noting in the overset that you need, put the cursor after the last character you want do keep, then press Cmd (Ctrl) + Shift + End on the keyboard to select everything from taht point to the end of the story, and delete it, or if you want to be cautious, cut it to the clipbaord and paste into a new frame that is NOT threaded to the original for examination.