"Clued up" is a slang term which means someone who is well-informed, knowledgeable or has a good understanding of a particular topic. Alternatives to this phrase include "in the know," "well-versed," "knowledgeable," "well-informed," "savvy," "aware," "well-acquainted," "versed," "familiar," "cognizant," "enlightened," and "informed." These words convey a sense of understanding, expertise and wisdom which can indicate someone has a deep understanding of a subject. Whether you are preparing for a job interview or trying to impress your colleagues, using these synonyms instead of "clued up" can help communicate your expertise and knowledge on a particular topic.