Second date in which fashion is not the main attraction (8)
I believe the answer is:
sideshow
'second date in which fashion is not the main attraction' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'second date in which' is the wordplay.
'second' becomes 's' (common abbreviation).
'date' becomes 'ides' (I've seen this before).
'in which' becomes 'how' (I can't explain this - if you can you should believe this answer much more).
's'+'ides'+'how'='SIDESHOW'
Can you help me to learn more?
(Other definitions for sideshow that I've seen before include "Minor but diverting incident" , "Exhibition subordinate to a larger one" , "Not the main scene of activity" , "Subordinate production to the main event" , "Activity subordinate to a larger one" .)