Spanish region associated with Don Quixote (2,6)
I believe the answer is:
la mancha
'spanish region associated with don quixote' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for la mancha that I've seen before include "Don Quixote's region of Spain" , "Don Quixote's home" , "Spanish region associated with Don Quixote" , "Don's home" , "Musical about Don Quixote 'Man of . . . . . . . ." .)