Zappa's commercial album? Absolutely (8)
I believe the answer is:
strictly
I believe this is a double definition.
'zappa's commercial album?' is the first definition.
(Strictly Commercial is a Frank Zappa album)
'absolutely' is the second definition.
(thesaurus)
(Other definitions for strictly that I've seen before include "Stringently or sternly" , "In a rigorous manner" , "to be completely accurate" , "-- Come Dancing" , "Popularly a TV series" .)