Volition's something that may get Spooner a little ruffled? (4,4)

I believe the answer is:

free will

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'volition's' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for free will that I've seen before include "The power of determining one's own actions" , "Freedom of choice" , "The power of choosing own course of action" , "Unrestricted choice" , "Power of acting unconstrainedly" .)

I've seen this clue in The Telegraph.

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