One who needs insects to thrive — such as hartebeest? (3,6)

I believe the answer is:

bee keeper

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'one who needs insects to thrive' is the definition.
(a bee-keeper keeps insects)

I cannot understand how the rest of the clue works.

(Another definition for bee keeper that I've seen is " I look to buzzers".)

I've seen this clue in The Times.

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