To live in the future's ideal (6)
I believe the answer is:
reside
'to live' is the definition.
(residing is a kind of living)
'in the future's ideal' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RESIDE' is hidden within 'futures ideal'.
(Other definitions for reside that I've seen before include "Hang out with" , "Live in permanently" , "Stay - desire (anag)" , "Occupy a place" , "Live (at an address)" .)