Interrupt with "Copper and another metal" (3,2)
I believe the answer is:
cut in
'interrupt' is the definition.
(cutting in is a kind of interrupting)
'copper and another metal' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'and' is a charade indicator (letters next to each other).
'another metal' becomes 'tin' (tin is a kind of metal. I am not sure about the 'another' bit.).
'cu'+'tin'='CUT-IN'
'with' is the link.
Can you help me to learn more?
(Other definitions for cut in that I've seen before include "Interrupt; veer across another vehicle and take its space" , "Interrupt a conversation" , "drive dangerously" , "Interrupt someone speaking" , "interrupt speaker" .)