Murder in kitchen regularly ignored (3)
I believe the answer is:
ice
'murder' is the definition.
(slang term)
'kitchen regularly ignored' is the wordplay.
'regularly ignored' means one should take alternating letters (letters removed at regular intervals).
The alternate letters of 'kitchen' are 'ICE'.
'in' acts as a link.
(Other definitions for ice that I've seen before include "Decorate a cake" , "Diamonds (slang)" , "Finish decorating the Christmas cake" , "Rocks on which drink is served?" , "If it's thin, skating on it can be dangerous" .)