Crossword Genius

Bill throttles the most acidic little pest (5)

Ross

I believe the answer is:

aphid

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'little pest' is the definition.
(insect considered a pest)

I don't understand the remainder of the clue.

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(Other definitions for aphid that I've seen before include "Horticultural pest" , "Sap-sucking bug" , "Garden bug" , "Fly" , "Plant-louse" .)

I've seen this clue in The Times.
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