Assembled to roam about a particular place (8)
I believe the answer is:
gathered
'assembled' is the definition.
('gather' can be a synonym of 'assemble')
'roam about a particular place' is the wordplay.
'roam' becomes 'gad' (gadding is a kind of roaming).
'about' means one lot of letters goes inside another.
'a particular place' becomes 'there' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gad' enclosing 'there' is 'GATHERED'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for gathered that I've seen before include "Drew" , "Picked up" , "Understood" , "Gleaned" , "Surmised" .)