Crossword Genius

Kill lots of black birds (6)

Ross

I believe the answer is:

murder

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'kill' is the definition.
(murder is a kind of kill)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for murder that I've seen before include "Shoot dead" , "Unlawful premeditated killing" , "Voraciously consume" , "Kill" , "very difficult task" .)

I've seen this clue in The Telegraph.
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