Invade and live on a host (6)
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 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" .)