### Clue: Celebrity fringes at congress after the end of December can be a net attraction (8)
### Answer: CYBERSEX 
 ### Explanation: Definition: can be a net attraction
 **The 1st and last letters of**(… fringes) "Celebrity " **plus**(at) [ SEX(sexual congress) **placed after**(after) **the last 3 letters of**(the end of) "December " ].
Defn: …, on the Internet, that is.