Crossword Genius

Changing sides, beggar becomes more hopeful (8)

Ross

I believe the answer is:

brighter

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'more hopeful' is the definition.

I don't understand the remainder of the clue.

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(Other definitions for brighter that I've seen before include "Sunnier or smarter" , "Cleverer" , "Emitting more light" , "More sunny" , "More brilliant" .)

I've seen this clue in The Telegraph.
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