@alexialee,
gday, it would be a lot easier to help you if you put in the clue numbers so we could find the answers without looking through the list of clues
cabbage variety = chou
150a eagre, estuarine tidal wave
258a easter, irish insurrection
271a maggiore, swiss/italian lake
259d argot, groups jargon
278a tactless, insensitive
217d malachi,ol testament's final volume
good luck, hope this helped