Hitherto (10)
'hitherto' is the definition.
(I've seen this before)
This is the entire clue.
(Another definition for previously that I've seen is " Hitherto".)
'hitherto' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for thus far that I've seen before include "Up to this point" , "'Up to now (4,3)'" .)