«أَنَا ابْنُ جَلَا وَطَلَّاعُ الثَّنَايَا»
I am one who brings things into the open and scales difficult passes.
«مَتَى أَضَعِ الْعِمَامَةَ تَعْرِفُونِي»
When I remove my turban, you will recognize me.
The poetic expression jalā can be treated as implying an omitted described noun—one whose ability to disclose or confront difficulty is well known. Other grammatical analyses exist, but the rhetorical emphasis here is the vivid force of the descriptive expression.
Compressed wording concentrates the claim of courage and public recognition.