Straighten (something curled up) (6)

I believe the answer is:

uncoil

(Other definitions for uncoil that I've seen before include "Straighten out, unwind" , "Straighten from a curled position" , "Straighten from a curled state" , "Become unwound" , "Unwind or untwist" .)

I've seen this clue in The Guardian.

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