US author’s penning old rubbish for inert people (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

US author’s penning old rubbish for inert people [O (=old, as in Old Testament) + TAT (=rubbish)] in POE (=US author, i.e. Edgar Allan Poe)’S; e.g. couch potatoes are inert, inactive people