Very grateful for all help with these clues please.
15dn: “Unwell, ordered to swallow tablet by doctor (9).”
17dn: “Singers of music, keeping time (9).”
22ac: “Inclined to admit suspect is a mugger (9).”
26ac: “Keep going private say, only with 50 per cent off (7,2).”
27ac: “Who really has the power in emergencies at sea? (8,5).”