Crossword Genius

End morning piece working around one (8)

Ross

I believe the answer is:

ambition

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But I can't explain it at all! Could you help me understand?

(Other definitions for ambition that I've seen before include "Strong drive for success" , "Cherished aspiration" , "Objective" , "Desire to achieve success" , "Strong desire to achieve, fame or fortune" .)

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