Pan group concealing murder (7)
I believe the answer is:
skillet
'pan' is the definition.
(I know that skillet is a type of pan)
'group concealing murder' is the wordplay.
'group' becomes 'set' (both can mean a collection).
'concealing' indicates putting letters inside.
'murder' becomes 'kill' (I've seen this before).
'set' enclosing 'kill' is 'SKILLET'.
(Other definitions for skillet that I've seen before include "Small cooking pot" , "Long-handled cooking pot" , "Metal cooking pot with long handle" , "Frying-pan" , "Cooking-pot" .)