Dishonourable foundation (4)
I believe the answer is:
base
This could be a double definition.
'dishonourable' is the first definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'foundation' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for base that I've seen before include "Bottom support" , "unprincipled" , "This underlying structure" , "Infamous" , "Mil. operations centre" .)