Minimum requirement for a nudist camp! (4,9)

I believe the answer is:

bare necessity

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

'minimum' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'requirement for a nudist camp' is the wordplay.
'requirement' becomes 'necessity' (synonyms).
'for' says to put letters next to each other (I've seen this in other clues).
'a nudist camp' becomes 'bare' (I can't explain this - if you can you should believe this answer much more).
'necessity' after 'bare' is 'BARE NECESSITY'.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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