Crossword Genius

Heard a large, round rock but is much braver (6)

Ross

I believe the answer is:

bolder

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'braver' is the definition.
('bold' can be similar in meaning to 'brave')

I can't explain the remainder of the clue.

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(Other definitions for bolder that I've seen before include "Less shy" , "More impudent or daring" , "Braver or cheekier" .)

I've seen this clue in the Sydney Morning Herald.
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