Here "Hide" represents protecting, and "the secret plotting of evildoers represents" represents the harm that evildoers secretly plan to do to David. AT: "Protect me from the harm that evil doers secretly plan to do to me" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The words "hide me" are understood from the previous phrase and can be repeated here. AT: "hide me from the commotion" or "protect me from the commotion"(See: [[rc://en/ta/man/translate/figs-ellipsis]])
Possible meanings are that "commotion" refers to 1) a noisy disturbance. AT: "the noisy disturbance that the doers of iniquity make" or 2) a crowd that makes a noisy disturbance. AT: "the noisy crowd of doers of iniquity"