Plant louse (5)

I believe the answer is:

aphid

'plant louse' is the definition.
(aphid is a kind of plant louse)

This is the entire clue.

(Other definitions for aphid that I've seen before include "Sap-sucking bug" , "Greenfly etc" , "Plant-louse" , "plant pest" , "Small plant-sucking insect" .)

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

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