One who doesn't eat more quickly (6)

I believe the answer is:

faster

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'more quickly?' is the definition.
('faster' can be a synonym of 'more quickly')

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

Can you help me to learn more?

(Other definitions for faster that I've seen before include "Person going hungry" , "One refuses to eat" , "Moving more quickly" , "More speedy" , "Speedier" .)

I've seen this clue in The Independent and The Telegraph.

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