Follows us back into the superstructure (7)

I believe the answer is:
pursues
'follows' is the definition.
(pursuing is a kind of following)
'us back into the superstructure' is the wordplay.
'back' says the letters should be written in reverse.
'into' is an insertion indicator.
'the superstructure' becomes 'pures' (I can't explain this - if you can you should believe this answer much more).
'us' backwards is 'su'.
'su' placed inside 'pures' is 'PURSUES'.
Can you help me to learn more?
(Another definition for pursues that I've seen is " Chases".)
