As a whole, altogether (7)
I believe the answer is:
totally
I believe this clue is a double definition.
'as a whole' is the first definition.
(thesaurus)
'altogether' is the second definition.
(I know that altogether can be written as totally)
(Other definitions for totally that I've seen before include "without reservation" , "Absolutely" , "Altogether" , "Utterly" , "Wholly" .)