Salsa celebrated across this region of France (6)
I believe the answer is:
alsace
'region of france' is the definition.
(I've seen this before)
'salsa celebrated across' is the wordplay.
'across' indicates the answer is hidden within the clue.
'ALSACE' can be found hidden inside 'salsa celebrated'.
'this' acts as a link.
(Other definitions for alsace that I've seen before include "Region of northeastern France famous for its wines" , "part of France" , "French region; white wine" , "Wine-producing area" , "Region of northeastern France noted for its wines" .)