Crossword Genius

She's anything but worthless! (4)

Ross

I believe the answer is:

ruby

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'she's' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ruby that I've seen before include "Gemstone comprising mainly aluminium oxide" , "Vivid red" , "Jack perhaps" , "Deep 6 across" , "A red jewel" .)

I've seen this clue in the Evening Standard.
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