Crossword Genius

Rarest tuna cooked here? (10)

Ross

I believe the answer is:

restaurant

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'here?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'rarest tuna cooked' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'rarest'+'tuna'='raresttuna'
'raresttuna' is an anagram of 'RESTAURANT'.

Can you help me to learn more?

(Other definitions for restaurant that I've seen before include "Eatery" , "table here?" , "Eating place" .)

I've seen this clue in The Independent.
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