Halpern's working for change? (8)
I believe the answer is:
shrapnel
'change?' is the definition.
(both can mean coins)
'halpern's working' is the wordplay.
'working' indicates anagramming the letters.
'halperns' anagrammed gives 'SHRAPNEL'.
'for' is the link.
(Other definitions for shrapnel that I've seen before include "Fragments from exploded shell" , "Exploding shell fragments" , "Bits of shelling" , "bursting shells" , "Dangerous fragments" .)