Colonise (6)
I believe the answer is:
settle
'colonise' is the definition.
(I know that colonise is a more specific form of settle)
This is the entire clue.
(Other definitions for settle that I've seen before include "Resolve - to pay one's debts" , "Find a home" , "Resolve; alight" , "rest > put in order" , "Come to an agreement about something" .)