Policeman arresting husband with axe (7)
I believe the answer is:
chopper
'axe' is the definition.
(I've seen this before)
'policeman arresting husband with' is the wordplay.
'policeman' becomes 'copper' (copper is a kind of policeman).
'arresting' is an insertion indicator.
'husband with' becomes 'h' (I am not sure about the 'with' bit.**).
'copper' enclosing 'h' is 'CHOPPER'.
Can you help me to learn more?
(Other definitions for chopper that I've seen before include "Hatchet" , "Motorbike" , "that's used by a lumberjack" , "Blade" , "An axe, or a slang helicopter" .)