Fury over silver piercing (4)
I believe the answer is:
rage
'fury' is the definition.
(I know that fury can be written as rage)
'over silver piercing' is the wordplay.
'over' becomes 're' ().
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'piercing' is an insertion indicator (some letters pierce a hole in others).
're' going around 'ag' is 'RAGE'.
(Other definitions for rage that I've seen before include "Be furious" , "storm" , "Fury, passion" , "Fit of temper" , "Uncontrolled anger" .)