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Fitness is for getting away from Other Half (6)

Ross

I believe the answer is:

health

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'fitness' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for health that I've seen before include "Well being; a toast" , "Fettle -- condition" , "Fine condition" , "Physical welfare" , "good shape" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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