Wrong about a piece of jewellery (7)
I believe the answer is:
earring
'a piece of jewellery' is the definition.
(I've seen this before)
'wrong about' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'wrong' could be 'erring' (I've seen this before) and 'erring' is present in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for earring that I've seen before include "Otic adornment" , "Decoration" , "Aural pendant" , "Lobe pendant" , "Stud, perhaps, or a drop?" .)