Sense a trap? (5,1,3)

I believe the answer is:

smell a rat

(Other definitions for smell a rat that I've seen before include "Become suspicious" , "Sense something is amiss" , "Have suspicion something is afoot" , "Suspect deception" , "Find something fishy" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.