The headword and the glossing phrase are feminine singular accusative (the headword being a present active participle, in uncontracted epic/Ionic form, of e)sxato/w).
As Adler notes, the entry is probably derived from the scholia to Homer, Iliad 2.508; the headword occurs there, as a geographical description of the city of Anthedon (on the coast of NE Boeotia; see under alpha 1268), in the Catalogue of Ships (web address 1). The phrase is quoted by Strabo (1.2.3, 9.2.13, 9.2.14), Herodian, Stephanus of Byzantium, and others.