Follow important incident in athletics competition, say (5,5)
I believe the answer is:
track event
'follow important incident' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'athletics competition say' is the wordplay.
'athletics' becomes 'track' (track is a kind of athletics).
'competition say' becomes 'event' (competition is a kind of event).
'track'+'event'='TRACK EVENT'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for track event that I've seen before include "running competition" , "Eg, running race" .)