They pay for colonisers (8)
I believe the answer is:
settlers
I believe this is a double definition.
'they pay' is the first definition.
'colonisers' is the second definition.
'for' is the link.
(Other definitions for settlers that I've seen before include "Trestles for pioneers" , "Immigrants" , "who pay their bills?" , "Pioneers, homesteaders" , "Colonists" .)