Look hurt when you get a shiner (6)

I believe the answer is:

glower

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'look' is the definition.
(I know that glower is a more specific form of the action stare)

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

Can you help me to learn more?

(Other definitions for glower that I've seen before include "firefly?" , "Angry stare" , "Look hotly or angrily" , "burning ember, say?" , "shiner?" .)

I've seen this clue in the Evening Standard.

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