A Ted - teen rebel and the one at the event (8)
I believe the answer is:
attendee
'the one at the event' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'a ted teen rebel' is the wordplay.
'rebel' indicates an anagram.
'ted'+'teen'='tedteen'
'tedteen' with letters rearranged gives 'ttendee'.
'a'+'ttendee'='ATTENDEE'
'and' is the link.
Can you help me to learn more?
(Other definitions for attendee that I've seen before include "One shows up" , "Person who is present at an event" , "Mixture for soaking meat in" , "Conference participant" , "One present (at event)" .)