Confinement at home after making inventions (5-2)
I believe the answer is:
lying-in
'confinement' is the definition.
(I know that confinement can be written as lying-in)
'home after making inventions' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'after' means one lot of letters go next to another.
'making inventions' becomes 'lying' (invention can mean a lie).
'in' after 'lying' is 'LYING-IN'.
'at' is the link.
(Other definitions for lying-in that I've seen before include "Confinement" , "Staying abed - confined in childbirth" .)