Shut up and break in to get the jewellery (7)
I believe the answer is:
pendant
'the jewellery' is the definition.
'shut up and break in' is the wordplay.
'shut up' becomes 'pent' (synonyms).
'break' indicates an anagram.
'in' indicates putting letters inside.
'and' with letters rearranged gives 'dan'.
'pent' going around 'dan' is 'PENDANT'.
'to get' is the link.
(Other definitions for pendant that I've seen before include "earring, say" , "item suspended" , "Hanging jewellery item" , "Panted after learned one" , "Ornament hanging from a piece of jewellery" .)