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(2 interconnected*)
9d)One letter with another,in a sense.(6)
-C-M-*
15ac)They describe Scottish island's backward hills.(9)
*-R-A-O-S
(I can see ACUMEN, if it is that,could you explain?).

15 narrators (arran backwards and tors)

Narra (arran backwards) +tors - narrators?

narrators

Latin Cum - with, so a with en, giving sense?

ab, rossim, and santa-thanks.