In just four lines, the speaker compares themselves to a parrot that has been carried away from the sea. A parrot repeats sounds it has picked up, so the image suggests a voice that is borrowed, displaced, or not quite at home. The sea is where this creature came from, and now it is somewhere else, speaking to "the light," which might mean daylight, attention, or the exposure of being seen.
The title, "Poet in public," gives a strong hint. The speaker seems to be a poet standing before an audience, feeling a little like a performing bird. The tone is self-mocking but also defiant. Speaking "like a ruffian" suggests rough, unpolished talk, as if the poet refuses to sound refined even when put on display.
The mood is wry and slightly uneasy. There is embarrassment in being on show, but also a stubborn pride in staying loud and untamed. The poem judges itself with humor while still insisting on its own voice.