Crossword Genius

Invade and live on a host (6)

Ross

I believe the answer is:

infest

(Other definitions for infest that I've seen before include "Annoyingly swarm through" , "Numerically swamp" , "Unwelcomely occupy" , "Invade in great numbers, as pests" , "Overrun" .)

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