κλεινᾶς ἐξ Ὀπόεντος: On the gender, compare O. 3.2: κλεινὰν Ἀκράγαντα. Pindar shows a special interest in the Lokrians (v. 23), and this has given rise to many historical fancies on the part of scholars.
αἰνήσαις: Aor., the result, as ἐλελίζων, pres., is the process. Dissen puts a full stop after Ὀπόεντος, and makes αἰνήσαις an opt. unnecessarily.