1. Is “all but forgotten” a novel (and valid) indicator? In the relevant clue’s context, couldn’t it just as easily signify T (or N, E, R or S)? In other words, I believe some indication of position should be given.
2. I’m experiencing the same echo as others. I find it hard to believe that it’s an oversight, in a puzzle that is otherwise so intricately clued. I see no apparent alternative, though, other than error. Troubling right out of the gate!