Dogs unleashed possibly taking steamship around carrier (6)
I believe the answer is:
strays
'dogs unleashed possibly' is the definition.
(as in stray dogs)
'steamship around carrier' is the wordplay.
'steamship' becomes 'ss' (nautical abbreviation).
'around' indicates putting letters inside.
'carrier' becomes 'tray' (I've seen this before).
'ss' enclosing 'tray' is 'STRAYS'.
'taking' acts as a link.
(Other definitions for strays that I've seen before include "Wanders off the right path" , "Wanders off course" , "Homeless animals" , "Wanders off the path, gets lost" , "Gets lost, wanders away from the track" .)