Crossword Genius

Look daggers as cultivator swapped hands (6)

Ross

I believe the answer is:

glower

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'look daggers' is the definition.
(I've seen this in another clue)

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 "Frown" , "burning ember, say?" , "Look hard and angrily" , "Threatening look" , "shiner?" .)

I've seen this clue in the Sydney Morning Herald.
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