Look! The strawberry roan is rearing! (6)

I believe the answer is:

gander

I'm a little stuck... Click here to teach me more about this clue!

'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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.