Establish a booth at home initially (7)
I believe the answer is:
install
'establish' is the definition.
(I know that establish can be written as install)
'a booth at home initially' is the wordplay.
'a booth' becomes 'stall' (synonyms).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'initially' says to put letters next to each other.
'stall' after 'in' is 'INSTALL'.
(Other definitions for install that I've seen before include "Put into position, ready for use" , "Put in place ready for use" , "place in office" , "Place in position, establish" , "put in office" .)