Trunk ultimately cut roughly (5)
I believe the answer is:
torso
'trunk' is the definition.
('torso' can be a synonym of 'trunk')
'ultimately cut roughly' is the wordplay.
'ultimately' says to take the final letters.
'roughly' becomes 'orso' ('or so' can be a synonym of 'roughly').
The final letter of 'cut' is 't'.
't'+'orso'='TORSO'
(Other definitions for torso that I've seen before include "Body without head, neck and limbs" , "Piece of bronze" , "Body's trunk" , "Body (excluding head, neck and limbs)" , "Trunk; headless, limbless body" .)