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Idealistic and somewhat unusual to dispense with tee? (8)

Ross

I believe the answer is:

quixotic

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'idealistic' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for quixotic that I've seen before include "Extravagantly chivalrous like Cerantes' Don" , "Absurdly impractical" , "Romantically impractical" , "Impractically idealistic" , "Having impractical ideas" .)

I've seen this clue in The Times.
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