Rubbish government engaged in black humour? (5)
I believe the answer is:
bilge
'rubbish' is the definition.
(I've seen this before)
'government engaged in black humour?' is the wordplay.
'government' becomes 'g' (abbreviation for government).
'engaged in' is an insertion indicator.
'black humour?' becomes 'bile' (I can't justify this - if you can you should believe this answer much more).
'g' put into 'bile' is 'BILGE'.
Can you help me to learn more?
(Other definitions for bilge that I've seen before include "Lowest internal portion of a ship's hull" , "Rubbish, nonsense; dirty water in ship" , "bull" , "Very long film, book etc" , "Filthy water that collects in the bottom of a boat" .)