Roaming (9)
I believe the answer is:
wandering
'roaming' is the definition.
('wander' can be a synonym of 'roam')
This is the entire clue.
(Other definitions for wandering that I've seen before include "Oceanic animal -- large bird's not a swan (anag)" , "vagrant" , "Straying" , "Moving about aimlessly" , "Rambling" .)