The headword is presumably (though not demonstrably) extracted from the quotation given.
[1] For this glossing cf. generally Hesychius tau916.
[2] Aelian fr. 43b Domingo-Forasté (40 Hercher); cf. iota 346 (Himeraia = Himera) and sigma 1330 (sukofantei=n); and see generally epsilon 3319, tau 612, tau 629. The grammar is not easily explicable. The preposition pro/s with a dative should mean 'in addition to'; it does not normally introduce the name of a legal punishment. The verb is regularly used in the middle voice in this meaning with the punishment in the genitive case (see LSJ III at web address 1). RD suggests that the final word of the sentence is an addition to the manuscripts and should be disregarded. This emendation gives the satisfactory sense: "sentence[d] Philodemus to exile, in addition to confiscation of property."
Since Philodemus was a common name in antiquity, this is unlikely to be the well-known Epicurean philosopher and poet of Roman times, whose works comprise the largest part of the collection from the library at the Villa of the Papyri (quite possibly Philodemus' own library; the home was the property of Philodemus' patron L. Calpurnius Piso Caesonius) being excavated at Herculaneum (OCD(4) 1132; Gigante 1-48). No Philodemus is securely attested in the history of the Greek city of Himera in Sicily (iota 347), birthplace of the poet Stesichorus (sigma 1095). It is nevertheless tantalizing (DW) that when Stephanus Grammaticus, in artem rhetoricam commentaria 317.33 (Rabe), gives four examples of names which follow a certain metrical pattern, the first is Stesichorus and the third Philodemus.
However, on the possibility that the Philodemus referenced in this entry is the Epicurean philosopher, see Sider pp.9ff., on this entry and the two entries cited above.