25 Across, Study? Unproductive to include only one-third of basics (5) ??A?N
26 Across, Puzzle solver resident in 10? (5) {10=EDINBURGH) (R?B??}
5 Down, Somewhere reflective about Democratic Party (6) S?I?D?
17 Down, Like Emperor dismissing the Queen? That's irreverent (7) I?P?O??