Hat and necklace jeweller ultimately junked (5)
I believe the answer is:
toque
'hat' is the definition.
(toque is a kind of hat)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for toque that I've seen before include "Small brimless hat" , "protection for the head" , "Woman's small hat" , "Small round hat" , "may be over head" .)