Completely; solely (8)
I believe the answer is:
entirely
I believe this clue is a double definition.
'completely' is the first definition.
(I know that completely can be written as entirely)
'solely' is the second definition.
(thesaurus)
(Other definitions for entirely that I've seen before include "Wholly, totally" , "'Fully, wholly (8)'" , "Without reservation" , "Fully or absolutely" , "without qualification _" .)