Hi, simond9x,
24ac: if you have the first three letters, you are just missing the unchecked letter. In the clue, “piece” refers to a coin. This coin is still in common use, and you need an Elizabethan spelling. Look for an 8-letter word meaning “sorry”, and remove the last four letters, which give you a type of wine.
In 42ac, “piece” gives a word that you could use to refer to a piece of cake or a piece of pie. This is surrounding K for king, and the final letter is an abbreviation for a Latin word meaning “take”. The definition is “rook”.
Hope this helps.