How you may draw back, wanting time: mistakenly (2,5)

I believe the answer is:

in error

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'mistakenly' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for in error that I've seen before include "Wrong" , "Mistaken" .)

I've seen this clue in The Everyman puzzle in The Observer.

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