Thanks ginge & drxx. I had RISEN in 15Ac. I thought "upthe pole" gave an anagram of SIREN. I now see that it is the definition, peculiarly, for SOUSED. I hope my fellow solvers on here can confirm my diagonally separated cells at
C10R3, C9R4, C5R5, C11R5, C6R6, C7R7, C11R8, C1R12, C7R12.