Online icon (6)
I believe the answer is:
avatar
'online icon' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avatar that I've seen before include "Person who embodies a particular ideal" , "Screen icon" , "Incarnation of a Hindu deity in human or animal form" , "Cyberspace representation of a person" , "New personification of a familiar idea" .)