Place to cleanse oneself of endless tinned food (3)

I believe the answer is:

spa

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'place' is the definition.
(I have seen 'place of treatment' mean 'spa' so perhaps 'place' could also mean 'spa')

I cannot understand how the rest of the clue works.

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(Other definitions for spa that I've seen before include "Curative resort" , "Watering hole" , "A curative mineral spring, or place with one" , "Resort with mineral water spring" , "Watering place" .)

I've seen this clue in The Independent.

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