Crossword Genius

Thinner banker? (6)

Ross

I believe the answer is:

leaner

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'thinner' is the definition.
('lean' is associated in meaning with 'thin')

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

Can you help me to learn more?

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

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