Complaint of one with ramshackle mansion (8)
I believe the answer is:
insomnia
'complaint' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'one with ramshackle mansion' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with' says to put letters next to each other.
'ramshackle' is an anagram indicator (I've seen this in other clues).
'mansion' is an anagram of '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" .)