Spooky spirit (5)
I believe this is a double definition.
'spooky' is the first definition.
(rum can mean peculiar)
'spirit' is the second definition.
(alcoholic spirit)
(Other definitions for rum that I've seen before include "Pirate's grog" , "Odd sort of spirit used in grog" , "Sugar-cane product" , "Strange; spirit" , "An odd kind of drink made from molasses" .)
(Other definitions for ghost that I've seen before include "Write for another" , "Pen for another" , "insubstantial presence" , "Author, secretly" , "Hamlet's spectral father" .)