Crossword Genius

Doctor set us in NHS basic premises (6,4)

Ross

I believe the answer is:

nissen huts

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'basic premises' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.

'doctor set us in nhs' is the wordplay.
'doctor' is an anagram indicator.
'set'+'us'+'in'+'nhs'='setusinnhs'
'setusinnhs' anagrammed gives 'NISSEN HUTS'.

Can you help me to learn more?

(Another definition for nissen huts that I've seen is " Prefabricated military buildings".)

I've seen this clue in The Guardian.
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