Resorts you may need a pass for? (4)

I believe the answer is:

spas

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'resorts' is the definition.
(spa is a kind of resort)

'you may need a pass for?' is the wordplay.
'pass' can be anagrammed to 'SPAS'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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