Weak to switch sides for gift (5)

I believe the answer is:

flair

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'for gift' is the definition.
(flair is a kind of gift)

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

(Other definitions for flair that I've seen before include "Talent; elegance" , "Taste" , "Natural ability/talent" , "gift" , "Intuitive discernment" .)

I've seen this clue in The Hindu.

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