Straightened things out and became more friendly (6)

I believe the answer is:

unbent

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'straightened' is the definition.
(unbending is a kind of straightening)

I cannot understand how the rest of the clue works.

(Other definitions for unbent that I've seen before include "Remaining straight" , "Relaxed, straightened up" .)

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

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