Ecstatic about turning up in home with no end of efficient order (8)
I believe the answer is:
neatness
'ecstatic about turning up in home with no end' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'efficient order' is the wordplay.
'efficient' becomes 'neat' (I've seen this before).
'order' becomes 'ness' (I can't justify this - if you can you should believe this answer much more).
'neat'+'ness'='NEATNESS'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for neatness that I've seen before include "Tidiness" , "Well ordered" , "Good order" , "Precision" , "Apple-pie order" .)