Crossword Genius

Bold and without limits, they grow rich (6)

Ross

I believe the answer is:

heroic

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

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

(Other definitions for heroic that I've seen before include "Very brave and noble" , "Supremely courageous and brave" , "Of deed or person, very brave" , "larger than life" , "Courageous - daring" .)

I've seen this clue in The Independent.
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