I'll give this one last bash today, probably about 2/3 solved. All Group 4 sorted, most of 2 (can identify the transformation). 1 & 3 still significant gaps. A couple of hints would be appreciated. 'Kidneys, one of them rare...' I have an answer that fits a Chambers entry but it is Latin and doesn't fit the second half of the clue as far as I can tell.
'French native servant....' I assumed I was looking for a servant with an s in but can't find a suitable synonym.
Thanks.