Pedant noted label worn by leading lady (8)
I believe the answer is:
stickler
'pedant' is the definition.
(a pedant is a stickler for detail)
'noted label worn by leading lady' is the wordplay.
I cannot really see how this works, but
'leading lady' could be 'er' (Elizabeth Regina) and 'er' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for stickler that I've seen before include "One insisting on correctness" , "Someone fastidious" , "Particular type" , "Punctilious, insistent person" , "Perfectionist" .)