ERNEST .. correct, I think, because the clue says "reportedly" and if you say (i.e. report) the word "Ernest" it sounds a bit like "a nest" - and a nest is inhabited by birds (which are covered in down). Hmmm .. maybe a bit tenuous.
Ernest & divebomb are correct. I'm stuck on
'Off in front, although it's banned' FORBADE fits which works with 'banned' but I can't see how it works witrh the rest of the clue.