Cowardliness - trait originally cultivated in royal household (7,6)
I believe the answer is:
windsor castle
'royal household' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'cowardliness trait originally cultivated' is the wordplay.
'originally' indicates taking the first letters.
'cultivated' is an anagram indicator.
The first letter of 'trait' is 't'.
'cowardliness'+'t'='cowardlinesst'
'cowardlinesst' is an anagram of 'WINDSOR CASTLE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for windsor castle that I've seen before include "Queen's residence" , "royal house" , "palace" , "Royal residence" .)