One fussing a lot about new necklace (7)
I believe the answer is:
pendant
'necklace' is the definition.
(thesaurus)
'one fussing a lot about new' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
'lot' could be 'd' and 'd' is present in the answer.
'new' could be 'n' (abbreviation as in New Testament NT) and 'n' is found within the answer.
The remaining letters 'pet' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pendant that I've seen before include "Ornament hanging from a piece of jewellery" , "earring, say" , "Panted after learned one" , "Hanging light" , "Ornament hanging from necklace" .)