Fragment of wrought silver? (6)
I believe the answer is:
sliver
'fragment' is the definition.
(I know that sliver is a type of bit)
'wrought silver?' is the wordplay.
'wrought' indicates anagramming the letters (wrought means beaten into a new shape).
'silver' with letters rearranged gives 'SLIVER'.
'of' acts as a link.
(Other definitions for sliver that I've seen before include "Thin fragment or slice" , "Tiny bit" , "Splinter of wood" , "Small thin sharp piece" , "Thin strip cut from glass or wood" .)