Crossword Genius

Just terrible losing first source of finance (8)

Ross

I believe the answer is:

rightful

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

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

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(Other definitions for rightful that I've seen before include "Lawful" , "According to justice" , "Proper - legitimate" , "Legitimate - deserved" , "Legally valid" .)

I've seen this clue in The Telegraph.
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