Tailor designs wrong item of clothing
I believe the answer is:
dressing gown
'item of clothing' is the definition.
'dressing gown' can be an answer for 'clothing' (dressing gown is a kind of clothing). I am not certain of the 'item of' bit.
'tailor designs wrong' is the wordplay.
'tailor' indicates an anagram (I've seen this in other clues).
'designs'+'wrong'='designswrong'
'designswrong' is an anagram of 'DRESSING-GOWN'.
Can you help me to learn more?
(Other definitions for dressing gown that I've seen before include "What Americans refer to as a bathrobe" , "Informal overall garment" , "wrap" .)