Cheap joke ultimately worries no comic (8)
I believe the answer is:
economic
'cheap' is the definition.
(I've seen this before)
'joke ultimately worries no comic' is the wordplay.
'ultimately' suggests the final letters.
'worries' indicates anagramming the letters.
The last letter of 'joke' is 'e'.
'no'+'comic'='nocomic'
'nocomic' anagrammed gives 'conomic'.
'e'+'conomic'='ECONOMIC'
(Other definitions for economic that I've seen before include "concerned with business" , "Inexpensive" , "Yielding a profit" , "Monetary; cost-effective" , "Relating to the circulation of money" .)