### Clue: Judge at home, immersed in dictionary, is happy being sophisticated (6-2)
### Answer: JOINED-UP 
 ### Explanation: Definition: sophisticated
A charade of J ('judge') plus OINEDUP, an envelope ('immersed in') of IN ('at home') in OED (Oxford English 'Dictionary') plus UP ('happy' – 'is' is superfluous to the wordplay).