Text antiquarian, discovering it's still around (6)
I believe the answer is:
extant
'still around' is the definition.
(I've seen this in another clue)
'text antiquarian discovering' is the wordplay.
'discovering' indicates a hidden word (I've seen 'discovered' mean this (remove the letters covering the answer in the clue)).
'EXTANT' can be found hidden inside 'text antiquarian'.
'it's' is the link.
(Other definitions for extant that I've seen before include "Still existing, not obsolete" , "Still in existence, surviving" , "Still living" , "Still existing and in use" , "Currently in existence" .)