Answer:

nis

AnswerCrossword Clue
NISStart of the 14th title in a Sue Grafton series
NISSerbian city
NISCity in Serbia
NIS"... for Noose" (Sue Grafton book)
NISGrafton's ".. for Noose"
NISSue Grafton's "... for Noose"
NISGrafton's "... for Noose"
NIS".. for Noose": Grafton novel
NISCity in Yugoslavia
NIS".. for Noose" (Grafton book)
NISBirthplace of Constantine the Great
NISTitle starter of the 14th Kinsey Millhone novel
NIS".. for Noose" (Grafton novel)
NISBrownie.
NISNorse goblin: Var.
NISKobold.
NISYugoslav city threatened by Tito.
NISCity in Yugoslavia.
NISYugoslav city.
NISKobold: Var.
NISGoblin.
NISScandinavian brownie.
NISSerbian capital.
NISSerbian city.
NISYugoslav city, once capital of Serbia.
NISCapital of Serbia.
NISCity in east Yugoslavia.
NISCity of Yugoslavia.
NISCity in Serbia.
NISCity near Belgrade.
NISCity on the Nishava River.
NISGoblin: Var.
NISCity of Serbia.
NISElf or brownie.
NISBrownie: Var.
NISBalkan city.
NISNorse brownie.
NISYugoslavia city.
NISKobold
NISYugoslav city