A well-equipped health centre (3)

I believe the answer is:

spa

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'health centre' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for spa that I've seen before include "Mineral-water resort" , "Bath, possibly" , "A therapeutic hot spring" , "Hydromassage facility" , "Bath - mineral water spring" .)

I've seen this clue in The Globe and Mail and The Irish Independent.

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