Which term could be used to describe a deceiver's cleverness in manipulation?

The term that best describes a deceiver's cleverness in manipulation is "guile." Guile refers to the quality of being cunning, clever, and deceitful, often employing trickery or deceit to achieve a particular goal. This characteristic is central to the concept of manipulation, as it implies an ability to outsmart others through shrewdness and tactical deception.

In contrast, the other terms provided do not convey the same sense of cunning deceit. "Hack" typically refers to unauthorized access to a system or process, often related to computer security, and does not relate to cleverness in human manipulation. "Gust" refers to a strong, brief burst of wind or a sudden increase in something, which is unrelated to deceit or cleverness. "Heed" means to pay attention to something or take notice, and does not imply any form of cunning or manipulation. Thus, "guile" is the most appropriate term to capture the essence of a deceiver's cleverness in manipulation.