Isolate (10)
I believe the answer is:
quarantine
'isolate' is the definition.
(quarantining is a kind of isolating)
This is all the clue.
(Other definitions for quarantine that I've seen before include "Period of isolation to prevent spread of disease" , "Isolate (to prevent spread of disease)" , "separate from others" , "solitary confinement" , "State of isolation" .)