16 down
Crimean
War
conference
site
boosted
at
city
close
to
Turkey
(5)
Crimean War conference site boosted at city close to Turkey (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Crimean War conference site, which is YALTA. The wordplay builds the answer from the bottom up (since "boosted" indicates a reversal in a down clue). First, take AT, then LA (abbreviation for Los Angeles, a city), then Y (the last letter of "Turkey", indicated by "close to"). Reading these upwards — that is, reversing Y + LA + TA — gives YALTA.