PUSAN

Set to 4 different clues across 4 published puzzles, most often “U.N. beachhead during the Korean War” — The New York Times, Saturday, 20 January 2007.

5 letters

Every clue on record, most used first

U.N. beachhead during the Korean Waronce
The New York Times — Saturday, 20 January 2007
South Korea's main portonce
The New York Times — Friday, 27 May 2005
Korean War beachhead siteonce
The New York Times — Saturday, 31 August 2002
Port on the Korea Straitonce
The New York Times — Tuesday, 2 October 2001