Stuck on several this week, but I will settle for 3 for now.
19d: "Republic starts to specify each document that's scanned (7) p-r---d I thought it might be something ending in card.
23d: "Poor scholars caught out with lots of sand (5) d---s ?dunes perhaps?
24d: "Old graduates, one with top job in Washington" (5) o---a
Thank you all of you. When I see the answers, I don't know why I didn't spot them myself! They look so obvious. Must be a senior moment day today! barrym