Sort out old trunk (5)
I believe the answer is:
torso
'trunk' is the definition.
(both can mean a person's chest)
'sort out old' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'sort' is an anagram of 'tors'.
'tors'+'o'='TORSO'
(Other definitions for torso that I've seen before include "Body's trunk" , "Body's core" , "Body, minus its head and limbs" , "upper body" , "Body (excluding head, neck and limbs)" .)