A sojourn at the abode of an unsociable person (4-2-4)
I believe the answer is:
'an unsociable person' is the definition.
'stay-at-home' can be an answer for 'person' (stay-at-home is a kind of person). I'm unsure of the 'an unsociable' bit.
'a sojourn at the abode' is the wordplay.
'a sojourn' becomes 'stay' (I've seen this before).
'the abode' becomes 'home' (synonyms).
'of' is the link.
Can you help me to learn more?
(Other definitions for stay-at-home that I've seen before include "Don't go out" , "Unadventurous in travel" , "Person disinclined to travel" , "One not given to travel" .)