Look! The strawberry roan is rearing! (6)

I believe the answer is:

gander

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

I don't understand how the remainder of the clue works.

(Other definitions for gander that I've seen before include "Ranged about with male goose" , "'What's sauce for the goose is sauce for the . . . . . .'" , "town in Newfoundland" , "He has webbed feet" , "Looking at something - ranged (anag)" .)

I've seen this clue in the Evening Standard.

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