Lasting forever (7)
(Other definitions for permanent that I've seen before include "Meant to remain indefinitely" , "Lasting; not temporary" , "Unchanging" , "full-time" , "Abiding" .)
'lasting forever' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ageless that I've seen before include "Never appearing to grow old" , "Always youthful" , "Lasting forever" , "Lasting a long time" , "Not appearing to grow older" .)
'lasting forever' is the definition.
(something eternal will last forever)
This is all the clue.
(Other definitions for eternal that I've seen before include "Undying" , "Permanent, without end" , "Forever or unchanging" , "Infinite - endless" , "One being forever" .)
'lasting forever' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for undying that I've seen before include "Lasting forever, not subject to mortality" , "Inextinguishable" , "Immortal, eternal" , "Constant" , "Everlasting" .)