Aspiring to be greedy about a jewellery item (6)
I believe the answer is:
hoping
'aspiring' is the definition.
(thesaurus)
'about a jewellery item' is the wordplay.
'about' is an insertion indicator.
'a jewellery' becomes 'pin' (pin is a kind of jewellery).
'item' becomes 'hog' (I can't justify this - if you can you should give a lot more credence to this answer).
'pin' going into 'hog' is 'HOPING'.
'to be greedy' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for hoping that I've seen before include "Trusting, expecting" , "Desiring with an expectation of success" , "Expecting and wishing" , "Having wish or desire for" .)