Leaves trendy gold jewellery at last (7)
I believe the answer is:
chicory
'leaves' is the definition.
(I've seen this before)
'trendy gold jewellery at last' is the wordplay.
'trendy' becomes 'chic' (I've seen this in another clue).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'at last' indicates one should take the final letters.
The last letter of 'jewellery' is 'y'.
'chic'+'or'+'y'='CHICORY'
(Other definitions for chicory that I've seen before include "used in salads" , "Plant with edible salad leaves" , "Plant used instead of coffee" , "Salad plant (with a root ground and used in coffee)" , "Root used as a coffee substitute" .)