Cryptic crossword clue
That strange London lecturer must leave after cool event 10

The most common and most likely answer to this crossword clue is the 10 letter word HEPTATHLON

I've seen this crossword clue in Independent
H
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Buddy explains!

The straight part
We know that "event" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case event = heptathlon.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does HEPTATHLON mean?

HEPTATHLON noun
  1. An athletic contest comprising seven events; contested mostly by women, for whom this is an Olympic sport.

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