17 Across, Stop a run-indication to stop playing? (6) ?R?E?T
19 Across, Agreed top player will bag odd bits total (7) S???L??
21 Across, Surrealist's question,framed in old English;'What's a concubine'? (9)
C?A??????
26 Across, Power without a base (4) SORRY NO LETTERS