2 A Viso(r) ?
An aviso was originally a kind of dispatch boat or "advice boat", carrying orders before the development of effective remote communication.
It's hard to tell how many letters the answer is with full stops at each end. Can you please use question marks to denote the letters required. It would also help if you could include the letter count in brackets to avoid confusion for the solver.
I.E
Old announcement is a face covering brief (5) ?v?s?
Ps, I'm not saying my answer is correct. Thanks.