Trunk with tangled roots (5)
I believe the answer is:
torso
'trunk' is the definition.
('torso' can be a synonym of 'trunk')
'tangled roots' is the wordplay.
'tangled' indicates anagramming the letters.
'roots' with letters rearranged gives 'TORSO'.
'with' is the link.
(Other definitions for torso that I've seen before include "Roost (anag)" , "Trunk; headless, limbless body" , "Roots (anag)" , "Piece of bronze" , "Body without head, neck and limbs" .)