Tenet of millenarianism will have faded, for example (6,7)
I believe the answer is:
future perfect
This clue could be a double definition.
'tenet of millenarianism' is the first definition.
The definition suggests a singular noun which matches the answer.
'faded for example' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'will have' is the link.
Can you help me to learn more?
(Other definitions for future perfect that I've seen before include "Tense describing actions that will be completed" , "Optimistic prediction" , "Utopian prospect" , "Tense (eg "will have done")" , "optimistic forecast?" .)