Crossword Genius

They possibly pass as healthy places (4)

Ross

I believe the answer is:

spas

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

'healthy places' is the definition.
The answer and definition can be both locations as well as being plural nouns.
Maybe there's an association between them I don't understand?

'they possibly pass' is the wordplay.
'pass' anagrams to 'SPAS'.
Though, I'm unsure how this is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for spas that I've seen before include "Mineral springs" , "Health resorts near springs" , "Bath and suchlike" .)

I've seen this clue in the Evening Standard.
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