Crossword Genius

Have raw recruits never been there? (9)

Ross

I believe the answer is:

cookhouse

I'm a little stuck... Click here to teach me more about this clue!

'have' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for cookhouse that I've seen is " Military kitchen building".)

I've seen this clue in the Evening Standard.
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