The following are solved but I can't see the full logic;
17a Mythological queen from the East has spell in castle (7) - ARUNDEL = castle, what about he rest of the clue?
5d Security needed by elected democrat with lousy, disheartened support (9) I have INDEMNITY. I get the in and dem but not the rest...
12d Pen marking route on a trip on barge? (11) I have HIGHLIGHTER which explains pen bu thats it!
35d Cut-throat originally endowed with style, left abandoned (6-3) I have SWEENEY TODD but what about the rest of the clue?
Am I losing my marbles? or just sitting in Elgin Crescent?
all analgesics gratefully received!