Quixotic concerning rising storm (6)

I believe the answer is:

errant

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

I can't explain the remainder of the clue.

(Other definitions for errant that I've seen before include "Kind of knight who once travelled for adventure" , "Sinful" , "Misbehaving" , "like Don Quixote?" , "Straying; knight" .)

I've seen this clue in The Sunday Times and The Times.

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