The phrase "hath a flash" can be replaced with a variety of synonyms to convey the same meaning. Some possible options include "has an epiphany," "receives a sudden inspiration," "gets a bolt of inspiration," "has a moment of clarity," or "experiences a sudden realization." Each of these phrases conveys the idea of suddenly understanding or discovering something new, and can be used in a variety of contexts. Whether in a creative or professional setting, using the right synonym for "hath a flash" can help communicate your message more effectively and create a more engaging experience for your audience.