Thanks, Mamya. 'And' for 'also' must be right. But 'SS' for on board? I am afraid I am just being dim. The only alternative answer would be 'inlands', I think, which would make no sense.
Finished this puzzle, but cannot see where
"cardinal" comes into the answer for 23ac,
for which the clue is:- "Taken, as cardinal
suggested". I believe the answer to be
"spoken for", but, as I say, I cannot see
what form "cardinal" takes.