Senior ministers lodge ineffective complaint ultimately (7)

I believe the answer is:
cabinet
'senior ministers' is the definition.
(I've seen this before)
'lodge ineffective complaint ultimately' is the wordplay.
'lodge' becomes 'cabin' (I can't explain this - if you can you should believe this answer much more).
'ultimately' says to take the final letters.
The last letters of 'ineffective complaint' are 'et'.
'cabin'+'et'='CABINET'
Can you help me to learn more?
(Other definitions for cabinet that I've seen before include "Piece of furniture or inner government group" , "Can bite (anag.)" , "Piece of furniture with doors, shelves and drawers" , "Piece of furniture for members of a government" , "some PMs dislike?" .)
