Visitor soon is packing trunk (5)
I believe the answer is:
torso
'trunk' is the definition.
(both can mean a person's chest)
'visitor soon is packing' is the wordplay.
'is packing' indicates the answer is hidden within the clue.
'TORSO' is hidden within 'visitor soon'.
(Other definitions for torso that I've seen before include "Poorly-dressed child" , "Roost on trunk?" , "part of body will be found" , "Body's core" , "unfinished work" .)