Crossword Genius

Dutch uncle only bold... (9)

Ross

I believe the answer is:

dauntless

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'bold' is the definition.
(similar in meaning)

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

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(Other definitions for dauntless that I've seen before include "Invulnerable to fear" , "Resolute" , "Intrepid" , "Boldly undeterred" , "Brave" .)

I've seen this clue in The Daily Express.
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