Significant moment displayed in vintage Times (4)
I believe the answer is:
crux
'significant moment' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'vintage times' is the wordplay.
'vintage' becomes 'cru' (e.g. grand cru).
'times' becomes 'x' (x resembles the multiplication or times sign).
'cru'+'x'='CRUX'
'displayed in' acts as a link.
Can you help me to learn more?
(Other definitions for crux that I've seen before include "Vital part of a matter, decisive point" , "Baffling problem" , "Nub" , "Essence or gist" , "puzzle" .)