Answer: windmill

AnswerCrossword Clue
WINDMILLClean energy source
WINDMILLNatural power generator
WINDMILLCape Cod structure.
WINDMILLTarget for Quixote
WINDMILLQuixote's opponent
windmillA pinwheel
windmillA similar structure used to generate electricity or draw water
windmillA propeller, esp. one used formerly on an autogiro
windmillA building with sails or vanes that turn in the wind and generate power to grind grain into flour
windmillto rotate from the force of air