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Reduced fare for buffet users? (6)

Ross

I believe the answer is:

snacks

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'users?' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for snacks that I've seen before include "Nibbles" , "Small or casual meals, often hurried" , "Light informal meals" , "Light repasts" , "Light bites such as crisps" .)

I've seen this clue in The Globe and Mail.
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