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10d: Never-----person's door; stay away from him? (6)D?R???
19a: One in Bonn (4) E?N?
21a: one ---- ---- deserves another? (4,4)???D ?URN
24d: ------- back; reverting to a subject or point (7) H?R?ING

Pl. help me with above clues (Not much of cryptic)

10d Darken
21a Good turn
24d Harking

Eine

Thank you Manxman and Bella for the help.