Support for speaker's notes (7)
(Other definitions for rostrum that I've seen before include "beak" , "stage" , "Rum rots (anag)" , "At which one may conduct" , "Platform for public speaking" .)
(Other definitions for lectern that I've seen before include "Stand with sloping top to hold reading material" , "Speaker's stand" , "From which speaker delivers" , "Slanted reading desk" , "Desk for a standing reader" .)