Take a potshot is an idiom which means to make a critical or mocking comment about someone or something. It is derived from the hunting term 'potshot', which refers to a shot taken at an animal from a distance, usually without taking aim. The crossword solution SNIPE is another hunting term which refers to a type of bird that is hunted by shooting at it from a distance. Therefore, SNIPE is an appropriate answer for the crossword clue TAKE A POTSHOT.