Cause and effect? (8)
I believe the answer is:
occasion
I believe this is a double definition.
'cause' is the first definition.
(occasion can mean a reason or cause)
'effect' is the second definition.
(thesaurus)
'and' is the link.
(Other definitions for occasion that I've seen before include "Special event; reason" , "Cocoa's in (anag.)" , "Give rise to" , "Need" , "Opportunity" .)