Complaint of one with ramshackle mansion (8)
I believe the answer is:
insomnia
'complaint' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'one with ramshackle mansion' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with' is a charade indicator (letters next to each other).
'ramshackle' indicates anagramming the letters (I've seen this in other clues).
'mansion' with letters rearranged gives 'nsomnia'.
'i'+'nsomnia'='INSOMNIA'
'of' is the link.
Can you help me to learn more?
(Other definitions for insomnia that I've seen before include "Condition affecting sleep" , "Inability to drop off" , "Habitual inability to sleep (8)" , "Sleep disorder" , "In restless state" .)