The phrase "gave a clue" implies that someone has provided information or assistance to solve a problem or mystery. Antonyms for this phrase would include "withheld information," "obscured the truth," "provided a red herring," or "misdirected attention." Instead of giving a clue, someone could "confuse," "baffle," "stump," "flummox," or "perplex" those seeking answers. Alternatively, they may simply say nothing at all, "keeping mum," "staying silent," or "refusing to divulge." In any case, antonyms for "gave a clue" suggest a lack of helpfulness or an active hindrance to understanding or discovery.