French region almost too wonderful? (6)
I believe the answer is:
'french region' is the definition.
(Alsace is an example)
'almost too wonderful?' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'too' becomes 'also' ('also' can be a synonym of 'too').
'wonderful?' becomes 'ace'.
'also' with its final letter removed is 'als'.
(Other definitions for alsace that I've seen before include "French ------ -Lorraine, was German 1872-1919" , "Region of northeastern France noted for its wines" , "part of France" , "Riesling-producing region eastern France" , "Wine-producing area" .)