Ruling colony (10)
I believe the answer is:
settlement
I believe this clue is a double definition.
'ruling' is the first definition.
(I've seen this before)
'colony' is the second definition.
('settlement' can be a synonym of 'colony')
(Other definitions for settlement that I've seen before include "Subsidence; payment" , "Hamlet - conclusion" , "Place where a community is established" , "Community - payment" , "it resolves the matter" .)