Same entry in other lexica; references at Photius pi1355, where Theodoridis lends his support to Naber's suggestion that the headword -- present indicative active, third person singular, of prospela/zw -- has been generated by the corresponding subjunctive prospela/zh| in Plato, Symposium 206D. (See also Xenophon, Cynegeticus 6.20.) There are, however, plenty of instances of prospela/zei itself.
For the gloss see already pi 2747.