The Father of the Marshalsea glanced at a passing Collegian with whom he was on friendly terms, as who should say, ‘An enfeebled old man, this; but he is my brother, sir, my brother, and the voice of Nature is potent!’ and steered his brother clear of the handle of the pump by the threadbare sleeve.
What does the term "as who should say" mean? What does "clear of the handle of the pump by the threadbare sleeve" mean?