JD - the clue has been completed as it is online. Having now completed the Everyman ( I hadn't started it earlier) all the letters of Bastille do fit. I think you are correct though and a word has not been printed in the paper/online that would finish the clue
I think the clue should have read "French can add butter to both sides of (+ a synonym for "ill"). Then it is simply baste "on both sides of" ill.