The headword is aorist active participle of ei)/kw, feminine accusative singular. For the glossing cf. scholion on Homer, Odyssey 5.126, where it occurs in the nominative (web address 1); also Hesychius epsilon981 (ei)/canta). The present headword itself must be quoted from somewhere else; perhaps Gregory of Nazianzus' Apologetica (PG 35.425.25).
For this verb, see also epsiloniota 91, epsiloniota 166.