Some of The Reds with revolutionary could be fairly mean and capable of lowering the tone in The House (6,6)
I believe the answer is:
colour scheme
'some of the reds with revolutionary could be fairly mean and capable of lowering the' is the definition.
I can't tell whether this definition defines the answer.
'tone in the house' is the wordplay.
'tone' becomes 'colour' (colour is a kind of tone).
'in the house' becomes 'scheme' (I can't justify this - if you can you should give a lot more credence to this answer).
'colour'+'scheme'='COLOUR SCHEME'
Can you help me to learn more?
(Other definitions for colour scheme that I've seen before include "dictating arrangements for the flat, say" , "Interior decoration plan" , "Arrangement or combination of tones and hues" .)