13a) Hard-pressed returning golden orioles' wings clipped? (6) I???E?
14d) After one's left, overtone's plain to see (5) no letters
15a) Undermine writer's piano melody (6) I?P?I? - is it impair?
17a) Queen hid former lover in conservatory, say (6) ?N???E
18d) Vet rewritten scene involving king (6) ???E?N
Is 23 down SUMS? All help greatly appreciated