Stickler conceals new lead in chandelier (7)
I believe the answer is:
pendant
'chandelier' is the definition.
(synonyms)
'stickler conceals new lead' is the wordplay.
'stickler' becomes 'pedant' (I've seen this before).
'conceals' means one lot of letters goes inside another.
'lead' suggests taking the first letters.
The first letter of 'new' is 'n'.
'pedant' going around 'n' is 'PENDANT'.
'in' acts as a link.
(Other definitions for pendant that I've seen before include "Ornament hanging from a piece of jewellery" , "earring, say" , "item suspended" , "Panted after learned one" , "One hung by the neck" .)