Decided to take possession of and to stop roaming (6,4)
I believe the answer is:
settle down
'stop roaming' is the definition.
I can't judge whether this definition defines the answer.
'decided to take possession of and' is the wordplay.
'decided' becomes 'settled' ('settle' can be a synonym of 'decide').
'to take possession of' becomes 'ow' (I can't justify this - if you can you should believe this answer much more).
'and' becomes 'n' (common abbreviation for 'and').
'settled'+'ow'+'n'='SETTLE DOWN'
'to' is the link.
Can you help me to learn more?
(Other definitions for settle down that I've seen before include "put down roots" , "Become quiet and orderly" .)