Monetary; cost-effective (8)
I believe the answer is:
economic
I believe this clue is a double definition.
'monetary' is the first definition.
(thesaurus)
'cost-effective' is the second definition.
(I've seen this in another clue)
(Other definitions for economic that I've seen before include "system of money" , "(Likely to be) profitable" , "Fiscal" , "Inexpensive" , "Comic one giving a good return for money laid out" .)