Box for a piece of jewellery (4)
I believe the answer is:
clip
This clue is a triple definition!
'box' is the first definition.
(both can mean to hit someone)
'for' is a link.
'a piece' is the second definition.
(thesaurus)
'of' is a link.
'jewellery' is the third definition.
(I know that clip is a type of jewellery)
(Other definitions for clip that I've seen before include "part for one that's the bulldog type?" , "Film extract; light blow" , "Cut - part of film" , "Extract; cartridge" , "Trim; jewellery item" .)