1630 We’ll ha ’t tomorrow night. You could, for ⟨a⟩ 1631 need, study a speech of some dozen or sixteen 1632 lines, which I would set down and insert in ’t, 1633 could you not?
Hamlet is conversing with one of the actors about possibilities for the play tomorrow, and he asks him if he was to write a couple lines that they could insert them into the play and learn them for the performance. Since the play Hamlet is asking about is called “The Murder of Gonzago” that makes me think he is planning a confrontation of Claudius, or at least a representation of the truth to get him squeamish. I think Halmet is going to write a couple lines that indirectly expose Old Denmarks murder.