Trunk and bunk turned round thus (5)
I believe the answer is:
torso
'trunk' is the definition.
(both can mean a person's chest)
'bunk turned round thus' is the wordplay.
'bunk' becomes 'rot' (synonyms).
'turned round' says the letters should be written in reverse.
'thus' becomes 'so' (synonyms).
'rot' reversed gives 'tor'.
'tor'+'so'='TORSO'
'and' is the link.
(Other definitions for torso that I've seen before include "Piece of bronze" , "Roots (anag)" , "Roots out in trunk of the body" , "Chest" , "Trunk; headless, limbless body" .)