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Adjective: clued-up  'klood'úp
Usage: informal
  1. [Brit, informal] Possessing sound knowledge
    "Pick a country about which you feel quite clued-up, but whose language you don't speak";
    - intelligent, well-informed, savvy [informal]
     
  2. Up to date with the latest developments
    - well-informed, in touch, plugged in [informal], switched on [informal]

See also: sophisticated