Hit with a fragment of shrapnel (3)
I believe the answer is:
rap
'hit' is the definition.
(I've seen this in other clues)
'a fragment of shrapnel' is the wordplay.
'a fragment of' says the answer is hidden in the clue (I've seen this in other clues).
'RAP' is hidden in the letters of 'shrapnel'.
'with' is the link.
(Other definitions for rap that I've seen before include "Rhythmic monologue (pop)" , "Smack (knuckles)" , "taken by those held to blame?" , "Strike; music style" , "Pounding" .)