Look - big Parisienne runs to the back (6)

I believe the answer is:

gander

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'look' is the definition.
(informal term for a look or glance)

I can't explain the rest of the clue.

(Other definitions for gander that I've seen before include "A butcher's -- bird" , "Ranged over the bird" , "Male goose - quick look" , "male member of the Anatidae family" , "Male goose; look (colloq.)" .)

I've seen this clue in The Guardian.

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