Crossword Genius

Continuing sunny at heart, with no money invested (8)

Ross

I believe the answer is:

unbroken

'continuing' is the definition.
('unbroken' is associated in meaning with 'continuing')

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

(Other definitions for unbroken that I've seen before include "Complete" , "One" , "Continuous" , "Not interrupted" , "not trained for riding" .)

I've seen this clue in The Times.
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