Crossword Genius

Restaurants or their customers (6)

Ross

I believe the answer is:

diners

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'restaurants' is the definition.
(diner is a kind of restaurant)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for diners that I've seen before include "Eaters of a meal" , "Restaurants" .)

I've seen this clue in The Mirror.
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