Has the wrong case (6)
I believe the answer is:
sheath
'case' is the definition.
(I know that case can be written as sheath)
'has the wrong' is the wordplay.
'wrong' indicates an anagram.
'has'+'the'='hasthe'
'hasthe' with letters rearranged gives 'SHEATH'.
(Other definitions for sheath that I've seen before include "coat" , "Sword covering" , "Case for a dagger" , "Holder for a dagger" , "(Blade's) cover" .)