Set up home above stable? (7)
I believe the answer is:
install
'set up' is the definition.
(synonyms)
'home above stable?' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'above' says to put letters next to each other (in a down clue, some letters go above others).
'stable?' becomes 'stall' (I've seen this in other clues).
'in'+'stall'='INSTALL'
(Other definitions for install that I've seen before include "Place in position, establish" , "Load up" , "Lodge" , "Set up, ready for use" , "Put in - invest" .)