Bold and without limits, they grow rich (6)
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" .)