Instant everything is set in position (7)
I believe the answer is:
install
'set in position' is the definition.
'install' can be an answer for 'position' (I've seen this before). I'm not certain of the 'set in' bit.
'instant everything' is the wordplay.
'instant' becomes 'inst' (synonyms).
'everything' becomes 'all' (all things).
'inst'+'all'='INSTALL'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for install that I've seen before include "Settle" , "Put into position, ready for use" , "put in office" , "Put in place ready for use" , "Set up, ready for use" .)