Andrea's opponent was honest and straightforward, but Andrea used her guile to win the contest. What type of context clue in the sentence can be used to determine the meaning of guile? a definition a synonym an antonym an inference

The clue that gives away the meaning of guile is an antonym: honest and straightforward. Her opponent played fair, but because Andrea used her shrewd or deceived her opponent, she won.

In the passage is said that Andrea's opponent was "honest and straightforward" and after this it says "but Andrea used her guile", the use of "but" shows how what Andrea did was the opposite or antonym to what her opponent did to win the contest, this is the clue to obtain the meaning of "guile".