Enduring out in space, learn to adapt (7)
I believe the answer is:
eternal
'enduring' is the definition.
(thesaurus)
'out in space learn to adapt' is the wordplay.
'out in space' becomes 'ET' (short for extra-terrestrial).
'to adapt' indicates anagramming the letters (I've seen 'adapted' mean this).
'learn' with letters rearranged gives 'ernal'.
'et'+'ernal'='ETERNAL'
(Other definitions for eternal that I've seen before include "with lasting benefit" , "going on for ever" , "Forever and always" , "abiding" , "Forever or unchanging" .)