Making mistake concerning item of jewellery second lady lost (6)
I believe the answer is:
erring
'making mistake concerning item' is the definition.
I can't judge whether this definition defines the answer.
'jewellery second lady lost' is the wordplay.
'jewellery' becomes 'earring' (type of jewellery).
'second lady' becomes 'a' (2nd letter of 'lady').
'lost' is a deletion indicator.
'earring' with 'a' taken away is 'ERRING'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for erring that I've seen before include "Making a mistake" , "Making 7 down" , "taking wrong direction" , "Sinful" , "Going wrong" .)