Both headword and gloss are aorist passive participles (masculine or neuter) in the genitive plural.
The double lambda in the headword is a misspelling: the word regularly appears as e(lixqe/ntwn, and is a form of the same verb as the single-lambda headwords of epsilon 872, etc. This is also the spelling in equivalent entries in previous lexica: Hesychius epsilon2120; Lexica Segueriana 216.15 Bachmann (though with smooth breathing); Photius, Lexicon epsilon629 Theodoridis. The ultimate source is probably the scholia to Homer, Iliad 12.74 (web address 1), where -- uniquely outside lexicography -- this form appears, as part of the phrase e(lixqe/ntwn u(p' *)Axaiw=n.