Somewhere in France, piece of offal's acerbic (6)
I believe the answer is:
alsace
'somewhere in france' is the definition.
(I've seen this before)
'piece of offal's acerbic' is the wordplay.
'piece of' indicates a hidden word.
'ALSACE' is hidden in the letters of 'offals acerbic'.
(Other definitions for alsace that I've seen before include "Region of France famous for white wine" , "Region of northeastern France famous for its wines" , "Region in France, occasionally German" , "Riesling-producing region eastern France" , "area of France" .)