Line snorted by PM's secretary in wellness facility (6,3)

I believe the answer is:

health spa

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'line snorted by pm's secretary' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'wellness facility' is the wordplay.
'wellness' becomes 'health' (I've seen this in another clue).
'facility' becomes 'spa' (I can't justify this - if you can you should believe this answer much more).
'health'+'spa'='HEALTH SPA'

'in' is the link.

Can you help me to learn more?

(Another definition for health spa that I've seen is " resort".)

I've seen this clue in The Independent.

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