Strengthening by pairing off? (7)

I believe the answer is:

bracing

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'strengthening' is the definition.
(bracing is a kind of strengthening)

I can't explain the rest of the clue.

(Other definitions for bracing that I've seen before include "Imparting vitality" , "Strengthening; fresh" , "Refreshing" , "Fresh and invigorating" , "Supporting" .)

I've seen this clue in The Irish Independent.

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