Daftness of adopting son, or madness? (8)
I believe the answer is:
insanity
'daftness' is the definition.
(thesaurus)
'adopting son or madness?' is the wordplay.
I cannot quite see how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is present in the answer.
The remaining letters 'inanity' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for insanity that I've seen before include "mania" , "Mental derangement" , "Lunacy, derangement" , "folly" , "Lunacy, madness" .)