Come to terms with colonial rule disappearing (6)
I believe the answer is:
settle
'come to terms' is the definition.
(I've seen this before)
'colonial rule disappearing' is the wordplay.
'colonial' becomes 'settler'.
'rule' becomes 'r' (legal abbreviation).
'disappearing' is a deletion indicator.
'settler' with 'r' taken away is 'SETTLE'.
'with' acts as a link.
(Other definitions for settle that I've seen before include "Light upon" , "Agree or decide (one's position)" , "Come to rest; bench" , "Resolve or precipitate" , "Become established, make one's home" .)