Crossword Genius

Skinnier student with empty stomach (6)

Ross

I believe the answer is:

leaner

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'skinnier' is the definition.
('lean' can be similar in meaning to 'skinny')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for leaner that I've seen before include "less productive" , "One with an inclination" , "Thinner, with less fat" , "less corpulent?" , "less bulky" .)

I've seen this clue in the Sydney Morning Herald.
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