Trace out a box (5)
I believe the answer is:
crate
'a box' is the definition.
(I know that crate is a type of box)
'trace out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'trace' is an anagram of 'CRATE'.
(Other definitions for crate that I've seen before include "Box for shipping" , "Old soldiers might be found in this" , "Packing case with wooden slats" , "Car that will hardly go" , "Wooden box" .)