Traditional grain-grinding structure (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
windmill
(Other definitions for windmill that I've seen before include "It would stir Quixote to action" , "Source of green power" , "Don Quixote was wont to tilt at it" , "Rotating toy" , "Generator to extract energy from moving air" .)