Special area where you may go to relax (3)

I believe the answer is:

spa

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'where you may go to relax' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.

'special area' is the wordplay.
'special' becomes 'sp' (abbreviation).
'area' becomes 'a' (maths abbreviation).
'sp'+'a'='SPA'

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(Other definitions for spa that I've seen before include "Watering hole" , "Hydromassage facility" , "Curative resort" , "Where people go for spring" , "Bath - mineral water spring" .)

I've seen this clue in The Times.

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