Always in same version (4)
I believe the answer is:
ever
'always' is the definition.
(synonyms)
'in same version' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EVER' is hidden within 'same version'.
(Other definitions for ever that I've seen before include "To the end of time" , "At all times, always" , "Always and permanent" , "constantly" , "Perpetually" .)