### Clue: That strange London lecturer must leave after cool event (10)
### Answer: HEPTATHLON 
 ### Explanation: Definition: event
 [**Anagram of**(… strange) THAT + "London" **minus**(… must leave) "don"(lecturer at a university, say) ] **placed after**(after) HEP(hip/cool/trendy).
Defn: An athletic … in which each competitor takes part in the same prescribed seven events.