10a Fashionable skirts first out in odd, fan-shaped arrangement (9) ?H?P?D?UM
Shipsdrum? Don't get it.
18ac Learners in boat losing stern on river (6) T??EES (Tirees?)
6dn Hot on river for pundits (6) ??N???
19ac Somebody among jihadists absorbed by foremost of modern thinking? The opposite (9)
MIS?NEI??
Please make my day!