Answer: uncleleo

AnswerCrossword Clue
UNCLELEOSeinfeld's eccentric relative
UNCLELEO"Seinfeld" character with the catchphrase "Jerry! Hello!"
UNCLELEOLesser "Seinfeld" role played by Len Lesser
UNCLELEOEccentric 'Seinfeld' character
UNCLELEOHelen Seinfeld's brother